Joseph Walker facing first degree murder charge

A New Jersey detective charged with fatally shooting an Anne Arundel County motorist during a road rage incident on I-97 is now facing a first degree murder charge.

Joseph Walker was previously facing a charge of second degree murder in the killing of 36-year-old Joseph Harvey Jr. in June.

Walker's attorney has said the detective did not initiate the fight and that Harvey ignored repeated warnings from Walker, who identified himself as a police officer. The attorney has said Walker's wife and children were in the van and Harvey threatened to kill the family.

Walker has been suspended from duty without pay.

The Associated Press contributed to this story.