Las Vegas Mayor Shelley Berkley said Thursday that city officials are taking last week’s fatal shooting involving two city maintenance workers very seriously.

Asked about allegations that the two men had been embroiled in a months-long dispute that included multiple complaints to human resources, Berkley said the city would leave no rock unturned in its effort to determine what led to the shooting.

“We are working very closely with Metro, so we can figure out exactly what transpired and why,” Berkley said. “We need to make sure that it never happens again, and the only way that you do that is to find out exactly what transpired.”

The Metropolitan Police Department said city employee Brysen Kim, 31, fatally shot his co-worker, Joey McLean, 41, at a maintenance yard in the 400 block of North Seventh Street, near East Mesquite Avenue, around 6 a.m. Friday.

McLean died at the scene.

An arrest report for Kim said the issues between Kim and McLean “have been brewing for approximately six months, all of which involved HR.”

Witnesses told police on the morning of the shooting that Kim and McLean were arguing when Kim attacked McLean, then shot him in the head.

Melvin Segovia, the pair’s supervisor, told police McLean was a “complicated worker” who had been in multiple arguments with Kim.

This is a developing story. Check back for updates.

Contact Akiya Dillon at adillon@reviewjournal.com