According to one news report, Eric Francis Corsino Avila, age 28, had stopped to help another person change a tire alongside the outer loop of I-495 just past northbound I-95.
Avila's vehicle and the vehicle with the flat tire were stopped on the side of the road between Route 1 and New Hampshire Avenue around 6 p.m.
A third vehicle veered onto the shoulder and struck the two stopped vehicles, striking Avila who was standing next to the vehicle with the flat tire.
Avila died around 7 p.m. after being rushed to Holy Cross Hospital in Silver Spring. He was a resident of Hyattsville.
The Prince George's Fire Department was on the scene to aid emergency personnel. A spokesperson for the fire department said that two other adults and two children under age 8 were also injured in the accident and taken to local trauma centers. Their injuries appeared to be non life-threatening, according to the spokesperson.
Maryland State Police closed part of the highway for several hours in order to investigate the cause of the accident. They have not yet released any more details on the crash.
Another news report suggested that there were more than three vehicles involved in the multi-car crash, but police have not yet released the names of any other drivers or the names of the others injured.
According to statistics from the Washington Post, the section of I-495 that runs through Prince George's County has the highest number of accidents of any other portion of the interstate.