THERESA, N.Y. -- A state trooper was shot and killed Sunday night while responding to a domestic incident in Jefferson County, state Trooper Jack Keller said.

The trooper was shot on Route 46, near Eddy Road, in the town of Theresa, said Keller, a state police spokesman.

Keller said he expects to release more information shortly.

WWNY-TV Channel 7 reported the trooper, as well as the wife of the shooter, have died. The shooting happened at 34371 Route 46 in Theresa, WWNY reported.

Several police vehicles escorted the ambulance carrying the trooper to Samaritan Medical Center in Watertown after the shooting, around 9 p.m., according to the news report.

The name the slain trooper has not been released.

WWNY also reported that a second ambulance was called to the scene about a half-hour later for someone with a "minor" gunshot wound. No other information was immediately available Sunday night.

Check back for updates.