Authorities have released the 911 call made by a Titusville cab driver early Wednesday morning moments after he was shot by a passenger.

A passenger, according to police, he had just shot and killed defending himself.

DISPATCHER: 911, what's the nature of your emergency.

CALLER: I'm out by Mockingbird..I just got shot.

DISPATCHER: You just got shot?

CALLER: I stretched out, and pulled my weapon, I don't know what happened. I’m the cab driver.

Investigators are trying to figure out what happened inside that cab just before 2 a.m.

The cab driver, who works for Global Cab Company, told police he picked up a man, 19-year-old Marize Simone Brooks, on DeLeon Avenue just down the

street, and was asked to drive him to Mockingbird Lane.

An argument ensued and the cab driver heard a bang and realized he had been shot in the back of the head.

“From what the cab driver described, almost like an ambush, he shot him for some unknown reason,” said Major Todd Hutchinson, with the Titusville Police Department.

The cab driver was able to pull out his own gun and return fire, killing Brooks.

Brooks has a lengthy criminal record, including grand theft of a vehicle and resisting arrest.

Investigators are looking into if the cab driver had a concealed weapons permit.

Meanwhile, detectives say he is still in the hospital, but expected to recover.

A cab company employee said by phone they aren't commenting on the incident.

The name of the cab driver has not been released yet.

Neighbors said they only learned of what had happened when officers arrived.

"I guess that's what woke me up, lights, cars, and I guess I just woke up. By the time I got off the bed and out to the front room all the cops were out there," said neighbor Vera Dasher.

Detectives are still sorting through evidence and the cab driver's story to figure out what led to the deadly shooting.

The State Attorney's Office is also reviewing the case.