Does anyone know what happened on the series finale of "Party of Five" many years ago?

CHECK OUT THIS LINK: There is a transcription of the finale episode.

http://partyoffive.tktv.net/Episodes6/23.html

During a family dinner at the restaurant, Bailey, Julia and Claudia all announce their plans to leave town to start over, it starts a wave of tension and arguments over ones priorities. But later, Charlie has a surprising revelation of his own when he tells them that he has decided to sell the house and split the money between them to peruse their own dreams. After thinking about it, the rest of siblings agree and decide to move on and let go of their past for good. Griffin also decides that it's time for him to move out of the Salinger garage and into a place of his own. With everyone leaving town, Charlie makes Luke the new partner in his furniture factory to give him support and to Daphne and little Diana while Charlie and Kirsten, expecting their first child, move into a new house with Owen to start anew and set the next stage for their new lives together.

Does anyone know who shot JR? Please, I know it happened YEARS AGO, but I never found out! Can you please help me?????