As jury selection begins in Sanford, Fla. Monday, George Zimmerman's attorneys have put out a tape they say will lend credibility to a separate recording of their client, shouting for help on a 911 call during his fateful Feb. 26, 2012 run-in with the late Trayvon Martin.

In the clip -- which Zimmerman's lawyers say came from a tape off Martin's cellphone -- you can see two men scuffling by a bicycle, and a voice that attorneys claim is the late Martin's, thereby confirming his presence on the Zimmerman 911 tape.