A Chicago homeowner shot and killed a a man Wednesday after witnessing an attempted theft from a vehicle. 

According to Chicago's WGN9, the unidentified 44-year-old was sitting on his porch when he heard a loud noise. When he left his porch to investigate, he noticed two men under a nearby vehicle, and the shootout began.

The Chicago news outlet reported the men were trying to steal a catalytic converter from the vehicle.

ELDERY RETIRED FIREFIGHTER WITH CONCEALED CARRY SHOOTS CHICAGO ROBBER DEAD: POLICE

The two men climbed out from under the car once they noticed the man, drew their guns and began to fire. The 44-year-old man, who is a licensed concealed carry holder, drew his gun and returned fire, hitting one of the men in the neck. That suspect was later pronounced dead after being taken to Illinois Masonic Medical Center

Chicago police are searching for the other suspect who fled. 

WGN 9 reports that police have identified the fallen suspect as Darion Blackman. Blackman had a history of firearm run-ins with the law. He was arrested in September for not possessing a valid Firearm Owner's Identification card.

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Fox News has reached out to Chicago PD for more information.

The incident comes just days after an elderly, retired firefighter shot and killed a man in self-defense during an attempted robbery.