A woman was allegedly shot and killed by her ex-husband during a graduation party in Gwinnett County on Saturday night, according to authorities.

The gunfire erupted just before 7:30 p.m. inside an event venue at the strip mall on Stone Mountain Highway, where responding officers found a woman dead from a gunshot wound, police said.

Authorities said the suspect was subdued by bystanders and taken into custody. The incident was domestic-related, Gwinnett police spokesperson Officer Mark Meyers said, adding that investigators were speaking with witnesses and looking at evidence to determine a motive.

“There was a graduation party occurring at the venue,” Meyers said. “The victim and suspect were formerly married.”

Their names will be released after next of kin has been notified, according to police.

On Sunday, The Atlanta Journal-Constitution reached out to the venue, which declined to comment. No other details were shared by police about what led to the incident.

Anyone with more information is asked to contact Gwinnett detectives at 770-513-5300. Tipsters can remain anonymous and be eligible for a cash reward. Contact Crime Stoppers Atlanta at 404-577-8477, text information to 274637 or visit the Crime Stoppers website.

— Please return to The Atlanta Journal-Constitution for updates.

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