Joseph Walker, a 40-year-old officer with the Hudson County Prosecutor's Office, is charged with second-degree murder and manslaughter in the Saturday night shooting death of Joseph Harvey Jr., 36, of Halethorpe, Md., in Anne Arundel County, The Jersey Journal reported.
Maryland State Police said in a statement the shooting occurred after both drivers got out of their cars about 8:30 p.m. EDT on the northbound lane of Route 3 at the exit for Interstate 97 near Millersville.
The Journal said a preliminary investigation by the Maryland State Police indicated the confrontation may have been precipitated by the men's vehicles making contact about a mile up the road.
After the two drivers pulled over, Harvey and a male passenger got out of their car and began walking toward Walker's minivan, parked about 100 to 150 feet away, police said. Walker then allegedly got out of the minivan, said he was a police officer and fired a .45-caliber Glock handgun, striking Harvey, The Washington Post reported.
Harvey was taken to a hospital where he died, Maryland State Police said.
Walker, who was being held at the Anne Arundel County Detention Center, was to have a bail review hearing Monday morning in District Court, a state police official said.
Hudson County Prosecutor's Office spokesman Gene Rubino said in a statement "one of our detectives" was involved in the fatal shooting while "off-duty and traveling in Maryland with his wife and children." He deferred questions in the case to Maryland authorities.
The Journal said public records show Walker has been a county employee for at least 17 years.