Two crooks open fire on man who sees them stealing catalytic converter. But their target is a concealed carrier — who shoots one of them to death.

On Wednesday night around 11:15 p.m., a 44-year-old man was sitting on the steps of his Chicago home on North Wolcott Avenue when he heard a loud noise from the street, police told the Chicago Sun-Times.

What happened next?

With that, the man walked toward the noise and saw two people under a car, police told the paper.

WGN-TV reported that the two men in question were attempting to steal a catalytic converter.

When they noticed they were being watched, they crawled out from under the car, pulled out their guns, and started shooting at the homeowner, the station said.