(CNN) -- A police officer shot and killed Corey Jones after his car broke down on a Florida highway this week, his relatives said. And they want to know why.
Jones, 31, was on his way home after playing drums at church early Sunday when his car stalled along Interstate 95, his family said.
Palm Beach Gardens police Officer Nouman Raja believed it was an abandoned car, and stopped to investigate, according to authorities.
Raja was on duty but was wearing civilian clothing and driving an unmarked car, police Chief Stephen Stepp told reporters.
"As the officer exited his vehicle, he was suddenly confronted by an armed subject," Stepp said.
"As a result of the confrontation, the officer discharged his firearm, resulting in the death of Mr. Corey Jones.
"A source close to the investigation told CNN on condition of anonymity Wednesday that investigators believe the shooting was a result of Jones and Raja misidentifying each other.
The source said Raja felt he had to check the car because there had been burglaries in the area recently and that burglars had parked near the ramp where Jones' vehicle was.
Raja "was working as part of a detail related to a string of burglaries in the city," Stepp told reporters Tuesday.
The anonymous source told CNN on Wednesday that investigators believe Raja may not have made it sufficiently clear he was an officer and that Jones may not have heard what the officer said.
Palm Beach Gardens police have not said how or whether Raja identified himself to Jones.