Police surveillance video taken the night that Trayvon Martin was shot dead shows no blood or bruises on George Zimmerman, the neighborhood watch captain who says he shot Martin after he was punched in the nose, knocked down and had his head slammed into the ground.

The surveillance video released Wednesday night by ABC News shows no obvious head injuries on Zimmerman. At one point, an officer inspects the back of Zimmerman's head but no medical actions were taken and interrogations followed.