An off-duty Los Angeles County Sheriff's Department deputy was shot and killed by police at a golf course on Tuesday after he allegedly started shooting his gun following a domestic situation.

Alejandro Diaz, 45, left his home at about 4 p.m. Tuesday with two guns after shooting one of them inside his home, police said. Diaz reportedly had been drinking and was "distraught" before firing, local outlet KTLA reported. Diaz's wife called the police, and another caller phoned them to say they saw a man heading to the Sierra Lakes Golf Club in Fontana with a gun.

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Officers responded and confronted Diaz, who reportedly began shooting.

"He started shooting. Shooting up everything. Scaring the golfers, shooting at police. It was bad," witness Myesha Dowe told Fox News Los Angeles.

Police fired shots and hit Diaz. He was attended to and transported to a nearby hospital, where he later died, authorities said. No police officers were injured in the shooting.

Authorities have reportedly not said if the gun Diaz was allegedly armed with was his service weapon.

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The San Bernardino County sheriff’s and district attorney’s offices are investigating the shooting, authorities said. The Fontana Police Department is said to be cooperating.

The Los Angeles County Sheriff’s Department said it "is deeply saddened to hear of the tragic shooting incident involving our off-duty deputy who passed away yesterday. We are in close communication with Fontana Police Department and the San Bernardino County Sheriff’s Department as they conduct their ongoing investigation. This incident is extremely difficult for the family, our personnel, and the officers involved."