Joseph Walker, New Jersey cop, arrested for fatally shooting man in alleged road rage incident

(CBS) MILLERSVILLE, Md. - An off-duty New Jersey police detective was being held on $1 million bond on Sunday night after police said he killed 36-year-old Joseph Harvey Jr. in what might have been a road rage incident, said CBS New York.

According to WCBS 880, Joseph Walker, 40,  was charged with second-degree murder and manslaughter after he allegedly fatally shot Harvey on Saturday night on the shoulder of a highway ramp near Baltimore.

Investigators said the confrontation began when Harvey, who was driving a Honda Accord, and Walker, who was driving his wife and three kids in a minivan, first came into contact on Route 3, reported CBS New York.

"The two vehicles came to rest there on the ramp," said Maryland State Police spokeswoman Elena Russo, according to the station. "The drivers exited the vehicles and another altercation ensued."

Russo said that Walker brandished a .45 caliber Glock and fired at Harvey multiple times, reported CBS New York.

The station said that as of Sunday night, authorities were still investigating what caused the fight.

One of Walker's neighbors told CBS New York, "He was just friendly -- the whole family is friendly...They're not overly talkative -- friendly guy -- seems to be really family-oriented."

The Walkers were in Maryland visiting family at the time of the incident, said the station.