Where can I find this event in the Bible?

Oh dang that was AHH..... King Davids sons.

Amnon and Absalom and, Tamar was the girl

2 Samuel 13

1 In the course of time, Amnon son of David fell in love with Tamar, the beautiful sister of Absalom son of David.

2 Amnon became frustrated to the point of illness on account of his sister Tamar, for she was a virgin, and it seemed impossible for him to do anything to her.

3 Now Amnon had a friend named Jonadab son of Shimeah, David's brother. Jonadab was a very shrewd man. 4 He asked Amnon, "Why do you, the king's son, look so haggard morning after morning? Won't you tell me?"

Amnon said to him, "I'm in love with Tamar, my brother Absalom's sister."

5 "Go to bed and pretend to be ill," Jonadab said. "When your father comes to see you, say to him, 'I would like my sister Tamar to come and give me something to eat. Let her prepare the food in my sight so I may watch her and then eat it from her hand.' "

6 So Amnon lay down and pretended to be ill. When the king came to see him, Amnon said to him, "I would like my sister Tamar to come and make some special bread in my sight, so I may eat from her hand."

7 David sent word to Tamar at the palace: "Go to the house of your brother Amnon and prepare some food for him." 8 So Tamar went to the house of her brother Amnon, who was lying down. She took some dough, kneaded it, made the bread in his sight and baked it. 9 Then she took the pan and served him the bread, but he refused to eat.

"Send everyone out of here," Amnon said. So everyone left him. 10 Then Amnon said to Tamar, "Bring the food here into my bedroom so I may eat from your hand." And Tamar took the bread she had prepared and brought it to her brother Amnon in his bedroom. 11 But when she took it to him to eat, he grabbed her and said, "Come to bed with me, my sister."

12 "Don't, my brother!" she said to him. "Don't force me. Such a thing should not be done in Israel! Don't do this wicked thing. 13 What about me? Where could I get rid of my disgrace? And what about you? You would be like one of the wicked fools in Israel. Please speak to the king; he will not keep me from being married to you." 14 But he refused to listen to her, and since he was stronger than she, he raped her.

15 Then Amnon hated her with intense hatred. In fact, he hated her more than he had loved her. Amnon said to her, "Get up and get out!"

16 "No!" she said to him. "Sending me away would be a greater wrong than what you have already done to me."

But he refused to listen to her. 17 He called his personal servant and said, "Get this woman out of here and bolt the door after her." 18 So his servant put her out and bolted the door after her. She was wearing a richly ornamented [a] robe, for this was the kind of garment the virgin daughters of the king wore. 19 Tamar put ashes on her head and tore the ornamented [b] robe she was wearing. She put her hand on her head and went away, weeping aloud as she went.

20 Her brother Absalom said to her, "Has that Amnon, your brother, been with you? Be quiet now, my sister; he is your brother. Don't take this thing to heart." And Tamar lived in her brother Absalom's house, a desolate woman.

21 When King David heard all this, he was furious. 22 Absalom never said a word to Amnon, either good or bad; he hated Amnon because he had disgraced his sister Tamar.

Absalom Kills Amnon

23 Two years later, when Absalom's sheepshearers were at Baal Hazor near the border of Ephraim, he invited all the king's sons to come there. 24 Absalom went to the king and said, "Your servant has had shearers come. Will the king and his officials please join me?"

25 "No, my son," the king replied. "All of us should not go; we would only be a burden to you." Although Absalom urged him, he still refused to go, but gave him his blessing.

26 Then Absalom said, "If not, please let my brother Amnon come with us."

The king asked him, "Why should he go with you?" 27 But Absalom urged him, so he sent with him Amnon and the rest of the king's sons.

28 Absalom ordered his men, "Listen! When Amnon is in high spirits from drinking wine and I say to you, 'Strike Amnon down,' then kill him. Don't be afraid. Have not I given you this order? Be strong and brave." 29 So Absalom's men did to Amnon what Absalom had ordered. Then all the king's sons got up, mounted their mules and fled.

30 While they were on their way, the report came to David: "Absalom has struck down all the king's sons; not one of them is left." 31 The king stood up, tore his clothes and lay down on the ground; and all his servants stood by with their clothes torn.

32 But Jonadab son of Shimeah, David's brother, said, "My lord should not think that they killed all the princes; only Amnon is dead. This has been Absalom's expressed intention ever since the day Amnon raped his sister Tamar. 33 My lord the king should not be concerned about the report that all the king's sons are dead. Only Amnon is dead."

34 Meanwhile, Absalom had fled.

Now the man standing watch looked up and saw many people on the road west of him, coming down the side of the hill. The watchman went and told the king, "I see men in the direction of Horonaim, on the side of the hill." [c]

35 Jonadab said to the king, "See, the king's sons are here; it has happened just as your servant said."

36 As he finished speaking, the king's sons came in, wailing loudly. The king, too, and all his servants wept very bitterly.

37 Absalom fled and went to Talmai son of Ammihud, the king of Geshur. But King David mourned for his son every day.

38 After Absalom fled and went to Geshur, he stayed there three years. 39 And the spirit of the king [d] longed to go to Absalom, for he was consoled concerning Amnon's death.

Try KJV 2nd Samuel chapters 11 and 12. This is the story about King David and Bathsheba. There's nothing about bread or suicide, but David did fall in love with Bathsheba and got her pregnant, then arranged for her husband to get killed in battle to get rid of him.

Oops. Thanks to the other answers, I read a little further and agree that the story of Ammon and Tamar bear certain similarities to the details of the story you remember.

You are probably thinking of 2 samuel chapter 13 where Amnon the son of King david was in love with his half sister tamar whose brother was Absalom

He did what you remember and raped her but did not kill her.

He hated her after wards and cast her out.

Absalom killed Amnon.

I think you are talking about Dinah though it only matches the part that she was raped.Probably try this scriptures.

Di′nah) [Judged [that is, acquitted; vindicated]].

Daughter of Jacob by Leah. Dinah may have been about six years of age when Jacob returned to Canaan and settled at Succoth, she having been born at Haran when her father was residing there.—Ge 30:21, 22, 25; 31:41.

At the time Jacob and his family were tenting outside the city of Shechem, young Dinah unwisely made it a practice to visit the Canaanite girls there. On one of these visits she was violated by Shechem the son of the Hivite chieftain Hamor. Shechem fell in love with her, and Dinah remained in his home until avenged by her full brothers Simeon and Levi. (Ge 34:1-31) Some contend that Dinah must have been just a child when she was violated. However, it must be borne in mind that before coming to Shechem, Jacob built a house and booths at Succoth, indicating that he resided there for some time. (Ge 33:17) At Shechem he bought a tract of land and apparently became established there for a while. All of this, together with the fact that Shechem fell in love with Dinah, the “young woman,” would argue that Dinah, though still young, was not a mere child at the time of her association with Shechem.—Ge 33:18, 19; 34:12.

Years later, Dinah, with the rest of Jacob’s household, came into Egypt at the invitation of Joseph.—Ge 46:7, 15.

Sounds like the story of Absalom. Try 2 Samuel 13

Here is a link to a Bible site if you don't have one handy.

http://www.studylight.org/

I have found the event. It's in chapter 13 of 2 Samuel. Here I'll type it down for you to see.

1 And it came about after such things that Ab´sa·lom the son of David had a beautiful sister whose name was Ta´mar, and Am´non the son of David fell in love with her. 2 And it was so distressing to Am´non that he felt sick on account of Ta´mar his sister, because she was a virgin, and it was difficult in the eyes of Am´non to do anything at all to her. 3 Now Am´non had a companion whose name was Je·hon´a·dab, the son of Shim´e·ah, David’s brother; and Je·hon´a·dab was a very wise man. 4 So he said to him: “Why are you, the son of the king, so downcast as this, morning by morning? Will you not tell me?” At this Am´non said to him: “With Ta´mar the sister of Ab´sa·lom my brother I am in love.” 5 Upon that Je·hon´a·dab said to him: “Lie down on your bed and play sick. And your father will certainly come to see you, and you must say to him, ‘Please, let Ta´mar my sister come in and give me bread as a patient, and she will have to make the bread of consolation under my eyes in order that I may see it, and I shall have to eat from her hand.’”

6 Accordingly Am´non lay down and played sick, and so the king came in to see him. Then Am´non said to the king: “Please, let Ta´mar my sister come in and bake two heart-shaped cakes under my eyes, that I may take bread as a patient from her hand.” 7 At that David sent to Ta´mar at the house, saying: “Go, please, to the house of Am´non your brother and make the bread of consolation for him.” 8 So Ta´mar went to the house of Am´non her brother while he was lying down. Then she took the flour dough and kneaded it and made the cakes under his eyes and cooked the heart-shaped cakes. 9 Finally she took the deep pan and poured it out before him, but Am´non refused to eat and said: “HAVE everybody go out from me!” Then everybody went out from him.

10 Am´non now said to Ta´mar: “Bring the bread of consolation to the interior room, that I may take it as a patient from your hand.” So Ta´mar took the heart-shaped cakes that she had made and brought them in to Am´non her brother in the interior room. 11 When she came near to him for him to eat, he at once grabbed hold of her and said to her: “Come, lie down with me, my sister.” 12 However, she said to him: “No, my brother! Do not humiliate me; for it is not usual to do that way in Israel. Do not do this disgraceful folly. 13 And I—where shall I cause my reproach to go? And you—you will become like one of the senseless men in Israel. And now speak, please, to the king; for he will not withhold me from you.” 14 And he did not consent to listen to her voice, but used strength superior to hers and humiliated her and lay down with her. 15 And Am´non began hating her with a very great hatred, because the hatred with which he hated her was greater than the love with which he had loved her, so that Am´non said to her: “Get up, go away!” 16 At this she said to him: “No, my brother; for this badness in sending me away is greater than the other that you have done with me!” And he did not consent to listen to her.

17 With that he called his attendant who waited upon him and said: “Send this person away from me, please, to the outside, and lock the door behind her.” 18 (Now upon her there was a striped robe; for that was the way the daughters of the king, the virgins, used to dress with sleeveless coats.) So his waiter proceeded to lead her clear outside, and he locked the door behind her. 19 Then Ta´mar placed ashes upon her head, and the striped robe that was upon her she ripped apart; and she kept her hands put upon her head and went walking away, crying out as she walked.

20 At this Ab´sa·lom her brother said to her: “Was it Am´non your brother that happened to be with you? And now, my sister, keep silent. He is your brother. Do not set your heart on this matter.” And Ta´mar began to dwell, while being kept from association [with others], at the house of Ab´sa·lom her brother. 21 And King David himself heard about all these things, and he became very angry. 22 And Ab´sa·lom did not speak with Am´non either bad or good; for Ab´sa·lom hated Am´non over the fact that he had humiliated Ta´mar his sister.

23 And it turned out after two full years that Ab´sa·lom came to have sheepshearers at Ba´al-ha´zor, which is close by E´phra·im; and Ab´sa·lom proceeded to invite all the sons of the king. 24 So Ab´sa·lom came in to the king and said: “Here, now, your servant has sheepshearers! Let the king go, please, and also his servants, with your servant.” 25 But the king said to Ab´sa·lom: “No, my son! Do not let all of us go, please, that we may not be a burden upon you.” Although he kept urging him, he did not consent to go but blessed him. 26 Finally Ab´sa·lom said: “If not [you], let Am´non my brother go with us, please.” At this the king said to him: “Why should he go with you?” 27 And Ab´sa·lom began to urge him, so that he sent Am´non and all the sons of the king with him.

28 Then Ab´sa·lom commanded his attendants, saying: “See, please, that just as soon as Am´non’s heart is in a merry mood with wine, and I shall certainly say to YOU, ‘Strike down Am´non!’ YOU must then put him to death. Do not be afraid. Have not I myself commanded YOU? Be strong and prove yourselves to be valiant men.” 29 And Ab´sa·lom’s attendants proceeded to do to Am´non just as Ab´sa·lom had commanded; and all the other sons of the king began to rise up and mount each one his mule and take to flight. 30 And it came about that, while they were on the way, the report itself came to David, saying: “Ab´sa·lom has struck down all the sons of the king, and not one of them has been left over.” 31 At this the king got up and ripped his clothes apart and lay upon the earth, and all his servants were standing by with their garments ripped apart.

32 However, Je·hon´a·dab the son of Shim´e·ah, David’s brother, answered and said: “Do not let my lord think that it is all the young men the sons of the king that they have put to death, for it is Am´non alone that has died, because at the order of Ab´sa·lom it has occurred as something appointed from the day that he humiliated Ta´mar his sister. 33 And now do not let my lord the king take to his heart the word, saying, ‘All the king’s sons themselves have died’; but it is Am´non alone that has died.”

34 Meantime, Ab´sa·lom went running away. Later the young man, the watchman, raised his eyes and saw, and, look! there were many people coming from the road behind him by the mountainside. 35 At this Je·hon´a·dab said to the king: “Look! The king’s sons themselves have come in. In accord with the word of your servant so it has taken place.” 36 And it came about that, as soon as he finished speaking, here the king’s sons themselves came in, and they began to raise their voice and weep; and even the king and all his servants wept with a very great weeping. 37 As for Ab´sa·lom, he ran off that he might go to Tal´mai the son of Am·mi´hud the king of Gesh´ur. And [David] continued to mourn over his son all the days. 38 As for Ab´sa·lom, he ran off and made his way to Gesh´ur; and he came to be there three years.

39 Finally [the soul of] David the king longed to go out to Ab´sa·lom; for he had comforted himself concerning Am´non, because he was dead.