Spider identification (black widow??)?

I found a spider in my basement. It was a small black spider. The normal ones are just house spiders not black ones. I took a closer look and noticed markings on its back. It has a shape like a black widow but the markings on its back were a dull yellow color not red. I did some research. I didn't want to kill a spider that wouldn't hurt me and then decided to spray it down with some raid ant and roach killer. It worked alright and within a few minutes it was dead. I then took a magnifying glass to it.

I'd say it looks a lot like the spider in this picture but the markings were not red but yellow. It has the same colored legs and body style.

Any ideas? I plan on getting it preserved. I have it frozen for now. It has lost a little of its color but it's not drying out any.

Ideas? Was this a widow. I live in Michigan if it is any help. I've heard they are common up here but not seen too often.