A Detroit police officer killed in a shootout with other officers Monday had called 911 from inside an abandoned building, threatening suicide and asking specifically for a special response team and a negotiator, according to dispatch audio reviewed by the Detroit Free Press.

"He's threatening to shoot if anyone else comes," the dispatcher said in audio posted online by Broadcastify, which captures police dispatch chatter.

The 45-year-old officer, a 13-year-veteran who was off-duty, was a member of the Detroit Police special response team, a highly trained, SWAT-like unit that responds to dangerous situations such as active shooters, police said. He had returned to work Oct. 3 after being on medical leave due to back pain.

He wasn't working, but police said he was in uniform with a high-powered file when he called 911 on Monday from a building near East Davison and St. Aubin streets.

"He's calling asking for SRT, and it sounds like he wants to stage a barricade," the dispatcher continued.

When officers arrived at the scene: "Radio, this is a serious ... we got a sergeant shooting up in the air," one told dispatch.

When the gunshots rang out, two responding officers took cover behind their car. The off-duty officer shot at them; both officers were hit in the leg. An officer returned fire, killing the shooting officer, police said.

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Detroit Police Chief James White after the shootings said the killed officer, whom he did not identify, asked for "suicide by cop." The officer aired a number of issues he had against leadership within the special response team in his 911 call, police said.

The officer said leadership in the unit didn't support him after he suffered an injury, a police spokesperson told the Free Press. The officer alleged favoritism and policy violations in his 911 call.

The department is mourning at the loss of one of their own, but also commended the responding officers "for their steadfast courage and strength of character under fire," police wrote in a statement a day after the shootings.