Both Mr. Pride and Mr. Valez have pleaded not guilty.

WSJ: Trial Opens in Slaying of Officer

Valez and Pride are also caught on surveillance cameras in the neighborhood fleeing the crime scene, including one that allegedly shows Mr. Pride ditching the murder weapon under a car, Mr. Taub said.

WSJ: Trial Opens in Slaying of Officer

Mr. Pride chose to shoot, firing a single shot that killed Officer Peter Figoski in the early morning hours of Dec. 12, 2011, prosecutor Kenneth Taub told a jury on the first day of a joint murder trial against Mr. Pride and Michael Valez, the alleged getaway driver that night.

WSJ: Trial Opens in Slaying of Officer