PHILADELPHIA — A police officer shot in the head during a robbery in a doughnut shop died and his killer remained at large. He was the third city officer shot in four days.

Chuck Cassidy, 54, died at 9:40 a.m. Thursday.

Despite a massive manhunt, authorities reported no good leads in their attempts to find the gunman. A $115,000 reward was announced for information leading to an arrest.

Cassidy, a married father of three, was shot in the forehead as he walked into a Dunkin' Donuts shop at around 10:30 a.m. Wednesday.