LEMOORE, CA. (THECOUNT) — Lemoore police officer Ramiro Trevino Jr. died of a self-inflicted gunshot injury after fatally shooting 31-year-old Johnathan Diaz and critically wounding 58-year-old Ramiro Trevino Sr, Diaz’s father, on Saturday in Hanford, California.

Authorities in California say the 32-year-old off-duty law enforcement officer killed a fellow police officer and critically wounded his father before killing himself in a shooting during a family birthday party.

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Authorities say, Diaz was a Lemoore police officer and a friend of Trevino Jr., who worked as a Kings County welfare fraud investigator, reports DecaturDaily.

Investigators say the shooting occurred around 9 p.m. at the party for the elder Trevino in the community about 33 miles (53 kilometers) south of Fresno.

Detectives say the two men intervened in a fight between Trevino Jr. and his girlfriend and soon after he armed himself with more than one gun.

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Geo quick facts: Lemoore is a city in Kings County, California, United States. Lemoore is located 7.5 miles west-southwest of Hanford, at an elevation of 230 feet. It is part of the Hanford-Corcoran Metropolitan Statistical Area. The population was 24,531 at the 2010 Census – Wikipedia.