Joshua Adam Sisson

A San Diego police officer who fatally shot a gay man on Friday has killed three people in less than three years.

The victim, 30-year-old Joshua Adam Sisson (pictured), was allegedly holding a large kitchen knife to his boyfriend’s neck before fleeing the scene of the domestic dispute.

Officer Richard Butera caught up with the man on Sixth Avenue in San Diego‘s Hillcrest neighborhood.

Despite the officer’s request, Sisson didn’t stop running, instead pointing the knife at Butera “in an aggressive stance.”

The office claims he feared for his safety and shot Sisson once in the chest.

He died at a hospital on Saturday.

Sisson, who was wanted for a parole violation, was employed at Camp Pendleton and studied computer science at California College San Diego.

His mother has launched a GoFundMe page to have his remains returns to Pennsylvania for burial.

“He was only 30,” his mother writes. “Contrary to the media reports he was a wonderful young man and overcame many obstacles…I need help bringing him home to Pennsylvania and giving him the burial he deserves.”