A man convicted of killing an off-duty Philadelphia police officer during a robbery attempt expressed no remorse as he was sentenced to life in prison.

Rafael Jones was sentenced Wednesday in the 2012 bus stop shooting of 40-year-old Officer Moses Walker Jr.

A co-defendant told authorities that Walker looked like an easy target as he listened to music on his headphones in street clothes after an overnight shift.

Prosecutors say the 25-year-old Jones shot Walker twice as he reached for his service weapon.

Defense lawyer Michael Coard argued that Jones was not the shooter. He vowed to appeal.

Prosecutors say Jones' criminal record dates back to a burglary charge at age 12.

Co-defendant Chauncier McFarland has pleaded guilty to third-degree murder and is set for sentencing in June.