Tim Hubbard, who is now a corporal, has been on desk duty for months as he rehabs from a gunshot wound to the hand.
It happened the night of January 17th, 2010 along an isolated road in East Goshen, Pa. Hubbard saw what appeared to be a bitter dispute between a man and a woman.
When he stopped to intervene, the woman jumped into a waiting car and the man - described as a stocky white male in his 20s - charged.
"I actually had my hand on the gun and as I was pushing that away the gun went off. It didn't really register at first that I had been shot," Hubbard said.
The gunman ran to his car, described as a dark, late 90s Honda with Delaware plates, and sped away.
The couple left behind a Wilmington Blue Rocks cap - one of 400 made for friends of the Christiana Care Health System - along with a new-looking Villanova basketball t-shirt.
Hubbard returned fire, but the suspects vanished into the night. Despite an exhaustive search, the attempted cop killer remains at large.
Police are hoping the woman with him will turn the man in for everyone's safety.
"We feel that the female knows the male individual," said Chief John Dumond.
"We want to make sure she's safe as well, that she's not in some kind of dangerous situation," Hubbard said. "As long as she carries around this information, she's in a dangerous situation."
Investigators have chased down 150 tip calls, but the trail remains cold. The Citizen's Crime Commission has posted a $30,000 reward for information leading to the gunman's arrest.
"If you have any concernt that you should have come forward earlier, maybe you're embarassed about that, please put that aside. All we want to do is find the shooter," said Chester County D.A. Joseph Carroll.
"If there's anybody out there with any potential information on this fellow, I hope they would just make a call," Hubbard said.
Anyone with information can call 215-546-TIPS.