Update: The San Jose Police Officers’ Association announced Friday it will cancel its gun raffle. Check back for updates.

A former San Jose independent police auditor is calling for San Jose police officers’ union to cancel its plan to raffle off a semiautomatic rifle on the heels of Sunday’s mass shooting at the Gilroy Garlic Festival.

The San Jose Police Officers’ Association advertised the gun raffle on page 26 of the July 2019 issue of its monthly magazine, The Vanguard, where it states proceeds will benefit the San Jose Police Department’s Chaplaincy.

Civilians are welcome to enter the raffle at $20 a ticket for a chance to win a Ruger PC Carbine 9mm semiautomatic rifle, according to the advertisement.

The raffle is scheduled to occur after the police union’s membership meeting on Tuesday. The winner must pick up the firearm by August 26, according to the advertisement.

LaDoris Cordell, San Jose’s former independent police auditor, told The Chronicle Thursday that supporting a police department’s chaplaincy by raffling the semiautomatic rifle has “no place in law enforcement.”

“When I think chaplaincy, I think of peace, I don’t think of violence, I don’t think of killing,” Cordell said. (The chaplaincy) deals with everything that is the antithesis of assault weapons. What kind of mentality is it that we’re going to put another assault weapon on the streets?”

Though the raffle was planned before a 19-year-old man opened fire at the Gilroy festival, killing three and injuring 13 others before getting fatally shot by police, Cordell said she hopes the union will cancel the raffle and make a commitment to never raffle any weapons in the future.

“I can’t think of one good, useful purpose where civilians can enter a raffle for an assault weapon,” Cordell said. “I think it’s indefensible.”

The police union could not be reached for comment on Thursday, and it’s unclear if the raffle will go on as advertised in the police union’s magazine. San Jose police officials also could not be reached for comment.

The WASR-10 semiautomatic rifle the shooter used in Sunday’s mass shooting was legally purchased in Fallon (Churchill County), Nevada, but he broke the law by bringing the gun into California because of the state’s assault weapons ban, a federal law enforcement official told The Chronicle earlier this week.

“You would think that after the mass shooting, where the shooter used a semiautomatic rifle to kill and maim, they would say, ‘hey, maybe we should rethink this,’” Cordell said. “I hope that others in San Jose and beyond, especially those in Gilroy, will raise their voices and demand that this raffle not be held and that they never auction off assault weapons.”

The raffle is sponsored by LC Action Police Supply, a San Jose-based distributor of law enforcement equipment, though it’s unclear if they provided the rifle up for the raffle.

Lauren Hernández is a San Francisco Chronicle staff writer. Email: lauren.hernandez@sfchronicle.com Twitter: @LaurenPorFavor