DEPTFORD TWP. -- A trooper struck by a vehicle while responding to a car fire Monday night has died of his injuries, New Jersey State Police confirmed this morning.

NJSP Trooper Sean Cullen, seen here when he was a Westampton police officer in 2012, died Tuesday, March 8, 2016 from injuries he sustained in the line of duty. (Nancy Rokos | Burlington County Times)

Trooper Sean Cullen, 31, was struck around 8:15 p.m. as he was walking near the crash scene on Interstate 295 southbound near milepost 23.4 at the scene of a car fire.

He was airlifted to Cooper University Hospital with head injuries where he died around 12:30 this morning, police said in an announcement.

The 22-year-old woman who struck him stopped immediately and is cooperating with police, authorities said. No charges had been filed as of Tuesday morning and police have not yet identified the driver.

She and another woman were taken to a hospital for treatment of unspecified injuries, according to 6ABC. No information on their conditions has been released.

Several police and fire vehicles were already at the fire scene with emergency lights activated when Cullen was struck, police noted in their announcement. It is not yet clear if Cullen was on the shoulder or in the lanes of travel on the highway.

Members of Cullen's family, several troopers and members of other law enforcement agencies held a vigil late into the evening at the hospital, police said.

Cullen was a member of the 154th State Police Class and was stationed at the Bellmawr Station. He had been a trooper for about two years. As a senior at Cinnaminson High School he also participated in the State police's youth training program.

He is the second trooper to die in an accident in the last three months. Trooper Eli McCarson, 30, died Dec. 17 in a car accident while responding to a domestic dispute call in Salem County.

Matt Gray may be reached at mgray@njadvancemedia.com. Follow him on Twitter @MattGraySJT. Find the South Jersey Times on Facebook.