William “Bill” Bohlke, mayor of Hollywood Park, Texas was attacked Monday by an aggressive male donkey he kept on his ranch.

WOAI-TV is reporting that the cause of death is still pending, but Chief Deputy David Soward of the Atascosa County Sheriff’s Office said the 500-pound donkey that Bohlke kept on his ranch is the most likely suspect.

“They [donkeys] can become very aggressive, very mean, sometimes triggered by a female in heat,” Soward told the San Antonio Express-News. “We’ll probably never know what triggered it, but it was evident that this particular donkey was involved, based on the evidence at the scene and what we saw on this donkey.”

Soward believes the death to be accidental, but didn’t get into specifics on how the donkey actually did it. “We can just surmise, based on the evidence that we have, all of that,” he told the paper.

Bohke was elected to his office in the San Antonio suburb, back in may. It was his first time to hold public office. Bohlke ran for office after retiring from the Air Force after 20 years of service.

A memorial service is scheduled for next Tuesday. The accused donkey remains on the ranch until the family makes a decision what to do with it.