A 61-year-old man in Maryland may spend the remainder of his days behind bars for killing a passenger on an MTA bus, fatally shooting the victim for refusing to apologize after bumping into him. A jury in Baltimore on Friday found James Richburg guilty on one count each of second-degree murder, use of a firearm in a crime of violence, and possession of a firearm by a prohibited person in last year's slaying of 30-year-old William Womack.