POTSDAM - A trooper who was shot in the shoulder while investigating a domestic dispute dropped her assailant with a single shot as he ran at her fellow officers, according to Acting State Police Superintendent Preston Felton.

Trooper Amanda Reif, 29, who recently returned from a maternity leave, responded to a 911 call about a domestic dispute around 4:45 p.m. Monday at a house along Route 56 between Potsdam and Massena in northern New York, Felton said. She was alone when she arrived, but other state and local police officers arrived shortly afterward, he said.

According to tentative information from the scene, Felton said, Steven McCumber, 45, fired one or two shots from a long gun, either a rifle or shotgun. Two projectiles were found in Reif's upper left shoulder, but it was unclear if it was one shot that fragmented. Two weapons were recovered from the scene.

McCumber apparently went into the house, came back out, and was met in the driveway by other state and local police, Felton said. They asked him to get down on the ground and he complied, but then rose “in an aggressive state” and ran toward the troopers, he said.

Reif fired one round from her service weapon, the new Glock .45-caliber pistol recently issued to troopers as an improvement on the previous issue Glock 9 mm, Felton said.

McCumber was pronounced dead at the scene. Felton didn't have information about other parties involved in the domestic disturbance.

Reif was listed in serious condition Monday night at Fletcher Allen Medical Center in Burlington, Vt., according to hospital spokesman Mike Noble.

Reif's husband, parents, and other relatives were at the hospital with her, Felton said. She has a 7-month-old baby boy, he said.

Felton said McCumber apparently had a long criminal history.

The shooting comes just weeks after state police buried the third trooper to die by gunfire in a little more than a year.

In March 2006, Trooper Andrew Sperr was shot to death when he pulled over a truck being driven by a bank robber.

Three months later, fugitive Ralph “Bucky” Phillips shot trooper Sean Brown in the stomach during a traffic stop, a shooting that launched what would become the state's largest manhunt. Brown survived. In August, Phillips shot two troopers, Donald Baker and Joseph Longobardo, as they hunted for him in the woods of western New York. Longobardo died three days later; Baker survived. Phillips was later captured.

Then, in April, 23-year-old Travis Trim shot a trooper during a traffic stop in Delaware County. The trooper lived and police were again hunting for a gunman. When troopers stormed a farmhouse where Trim hid the next morning, Trim and trooper David Brinkerhoff were killed and another trooper, Richard Mattson, was injured in the gunfight. Brinkerhoff was killed by friendly fire.