Murder trial begins in 1966 police shooting

William Barnes (left) was charged Monday, Sept. 3, 2007, with murder following the death of Walter T. Barclay (right), a rookie Philadelphia police officer he shot more than four decades ago, a crime for which he has already served a prison term. ((AP Photo/Philadelphia Police Department, File))

May 17, 2010 10:32:48 AM PDT
A man who already served time for attempted murder in the 1966 shooting of a police officer is now on trial for the officer's 2007 death.