The three-vehicle crash took place about 10 p.m. at the intersection of Ocean Avenue and Washington Boulevard, according to the Los Angeles Police Department.
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One of the Georgia firefighters was pronounced dead at the scene, LAPD Lt. Joseph Sanchez said.
"It is with great sadness that I report the death of Marietta Firefighter Ron C. Herens," the fire department's chief, Jackie Gibbs, said in a statement.
One of the Herens' colleagues suffered a possible broken collarbone and hip, and the other firefighter sustained lacerations. Both were taken to UCLA Medical Center for treatment.
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According to Gibbs, Herens was a passenger in the car with two fellow firefighters, Dillon Guest and Doug Blanchard.
The third vehicle was occupied by a couple who were unhurt, Sanchez said.
The unidentified DUI suspect was taken into custody.
News video showed several LAPD and Los Angeles Fire Department vehicles escorting a coroner's van as it transported the deceased victim's body away from the scene of the collision.
The Marietta firemen were part of a group of four firefighters who were visiting from Georgia on vacation, Gibbs said.
City News Service contributed to this report.