I remember seeing a case where I guess a guy gave another guy a ride, or didn't want to anymore, and tried to drive away, but the man found out where he lived and killed his mother. Anyone know the name?

Nevermind;

"
The answer to your question about the second case is as follows: Dorothy Donovan was the name of the murder victim; her son, who encountered the hitchhiker, is Charles Holden. A suspect was arrested this past January; his name is Gilbert E. Cannon.
"

http://www.sitcomsonline.com/boards/showthread.php?t=166329&highlight=hitchhiker+mother

Cool, you solved your own mystery in only 25 minutes. :cool:

The case was also the subject of an episode of Forensic Files. The name of the episode is "Stranger in the Night," and it originally aired this past December.

If you missed it, don't despair. It will be on again at some point. Just check the TruTV schedule every now and then to see if it is scheduled for re-airing soon.