KIRKLAND - Police said Wednesday they were searching “for at least one or two” more suspects in the shooting death of a decorated police officer who was killed in the aftermath of a jewelry heist.

“This is evolving by the minute,” Raymond Philo, chief of the New Hartford Town Police Department said. “Information has developed over the last 24 hours that indicates there are more than two individuals involved in this robbery who are still at large and considered armed and dangerous.”

Joseph Corr, 30, a six-year veteran of the department, was shot and killed Monday night while pursuing suspected jewel thieves Walter Richardson and John Healy.

Healy, 46, of the Bronx, was caught. He pleaded not guilty to a charge of second-degree murder, and was being held without bail in the Oneida County Jail. Healy is due to appear at a felony hearing on Friday, officials said.

Richardson, 36, who police said was the triggerman, was killed in a shootout with about a dozen U.S. marshals late Tuesday in Chester, Pa., 15 miles southwest of Philadelphia, after a daylong manhunt. A marshal shot in the exchange was not seriously injured and was treated at the scene.

The robbery at the Wilcox jewelry store in New Hartford, just south of Utica in central upstate New York, happened about 8:30 p.m. Monday. Officers arrived at the scene within minutes and began pursuing the suspects, who fled about five miles in a getaway car before crashing into a gas pump at a convenience store in Kirkland.

Corr ran after Richardson behind the store and into a nearby wooded area and was shot once in the neck, police said. He was then taken to St. Elizabeth's Hospital in Utica where he was pronounced dead.

U.S. Marshals Service spokesman David Dimmitt said the handgun recovered after Richardson was killed fit the general description of the murder weapon and was being analyzed.

Richardson fled the area after abducting a tow truck driver and released him unharmed in Allentown, Pa. The tow truck operator, who was not identified, was being questioned by Pennsylvania authorities and was expected to return to New Hartford on Wednesday night for further questioning, Philo said.

According to an audit of the jewelry store, approximately $1 million worth of watches, loose diamonds and assorted jewelry was taken in the heist. Authorities did not say if any of the missing items had been recovered.

Philo said the thieves disabled the surveillance equipment inside the store and restrained the employees, but one employee managed to make an abandoned 911 call, which allowed police to track where the call came from.

“It was well-planned,” Philo said, adding the suspects probably did surveillance of the store before the robbery.

Forensic experts were examining the corrupted files on the hard drives of the surveillance system in an effort to reconstruct any evidence that may have been captured electronically, Philo said.

Authorities declined to say whether they believed Healy and Richardson were part of a larger operation being investigated by the FBI that has robbed jewelry stores along the East Coast.

Behind the convenience store where Corr was shot, investigators were still searching for clues on Wednesday, using rakes to sift through the new-fallen snow.

Funeral services will be held Friday for Corr, who is survived by his wife, Tracie, 1-year-old daughter, Kaitlyn, and his parents. Two education funds have been set up for Kaitlyn.

“The community outpouring has been phenomenal. I've never seen anything like it,” Philo said. “People want to do something for this child and the family. We can only accept so many cakes and pies and bouquets of flowers. This allows people who really, really want to do something to do it. That might be one of the most important aspects of this.”