An Idaho man was shot dead in his own backyard when cops mistook him for a suspect who’d just fled from a traffic stop, police said.

The fatal shooting happened after midnight Monday in Idaho Falls after a deputy with the Bonneville County Sheriff’s Department pulled over a driver for a busted taillight, the Idaho Statesman reported.

The passenger in the car jumped out, sending the deputy chasing after him through a backyard — as the officer radioed to others that the suspect was wearing a black shirt with khaki pants, according to a probable cause affidavit seen by the outlet.

As police swarmed the area, they learned the suspect had several outstanding warrants — including one for felony battery on an officer, police said in a press release.

One Idaho Falls police officer spoke with a man who lived at the corner of Tendoy and Syngria drives, telling him they were looking for a suspect who’d fled from a traffic stop and warning him they’d be in the neighborhood.

Cops also got hold of the female driver of the car they pulled over, and the woman showed them a message from the suspect with his GPS location — which was in the backyard of the home on Tendoy and Syringa drives.

Officers surrounded the home — and that’s when they encountered a man in a black shirt with a gun, police said.

One Idaho Falls officer opened fire, with one shot striking the man, who died at the scene.

Police later learned that the slain man was actually a resident of the home — and the suspect was found a short time later hiding in a shed at a house on Linden Drive.

“We do not currently have the answers as to what exactly occurred during these moments,” Police Chief Bryce Johnson said at a news conference Monday.

The officer who fired the fatal shot, who has not been publicly identified, is on administrative leave. He was wearing a body camera at the time.

The suspect was booked into jail on the outstanding warrants and also cited for misdemeanor resisting arrest, the Idaho Statesman reported.

The incident is under investigation by the Eastern Idaho Central Incident Task Force.

“There are no words to express how heavy our hearts are today,” Johnson said. “This situation is devastatingly tragic for the family, for the officer, and those that love and care about them. We all feel the weight of what has occurred today.”