PHILADELPHIA (AP) – A police officer shot during a robbery died Thursday morning, and his killer remained at large. He was the third city officer shot in the span of four days.

Chuck Cassidy, 54, was shot in the forehead Wednesday at a Dunkin’ Donuts when a hooded robber spun from the counter and fired at him as he walked in the door, according to an employee.

The 25-year police veteran died at Albert Einstein Medical Center, Commissioner Sylvester Johnson said.

“This is a sad day for the city of Philadelphia,” Johnson said.

The gunman went into the shop and demanded money just before Cassidy opened the door, according to witnesses.

Police released portions of a chilling videotape that shows the hooded robber pushing aside two customers and waving a gun as he approaches the counter. It also shows him grabbing Cassidy’s pistol as he fled.

Investigators said they were not getting good leads; a $115,000 reward was announced Thursday for information leading to an arrest. The department also established a trust fund for Cassidy’s family.

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