A New Hampshire man is being held without bail after allegedly killing a Waltham police officer and National Grid utility worker as he barreled through a construction site on Totten Pond Road before crashing.

Peter Simon, 54, of Woodsville, N.H. faced arraignment Thursday morning in Waltham District Court where he was met in the packed courtroom with a crowd of grieving family and a show of solidarity and support from visibly shaken police officers and utility workers.

Simon, who had a cut above his eye and an abrasion on his face, was ordered held without bail pending a dangerousness hearing scheduled December 14.

The Middlesex DA’s office told the court the state’s intends to argue then that Simon should be locked up before his trial as there is probable cause he committed the actions he’s accused of and that there are “no conditions of pretrial release that would ensure the safety of the community.”

Simon faces a slew of charges including two counts of manslaughter, assault with a dangerous weapon, armed robbery, failure to stop for police, negligent operation of a motor vehicle, larceny of a motor vehicle, leaving the scene of an accident after causing personal injury and death, 2 counts of leaving the scene of an accident after causing property damage, two counts of assault with a dangerous weapon, a marked lanes violation, and unlicensed operation of a motor vehicle.

Simon is accused of running down officer Paul Tracey, 58, a 28-year veteran of the Waltham police department and Roderick Jackson, 36, a National Grid worker from Cambridge.

Tracey is a decorated veteran of the Waltham Police.

In 2018, he was hailed as a hero after he helped save the life of a woman who overdosed on drugs on a Cape Cod beach, Boston 25 reported at the time. Tracey was off duty, on a family vacation, at Riviera Beach Resort in South Yarmouth when he and a cousin began CPR on the woman in distress, the station reported.

“Paul Tracey served this great city with distinction,” said Waltham Police Chief Kevin O’Connell, visibly shaken up at a news conference Wednesday night after the deadly crash. “He was a compassionate police officer but always looked out for the underdog. He’s an amazing husband, loving father and a friend to all, especially the men and women of this police department.”

Two other utility workers were taken to a hospital after the crash, National Grid said. “Our thoughts are with the crew members, their families and loved ones,” the company said in a statement.

After crashing into the officer and utility workers at the detail site, Simon stole a Waltham police cruiser and fled the scene before crashing, according to the Massachusetts State Police.

“The suspect was then apprehended after a foot pursuit and is currently in custody,” the Middlesex DA’s Office said Wednesday in a statement. “This is a very active investigation and updates will be provided as they become available.”

– Developing