A 56-year-old man who had apparently been chasing his fleeing dog was struck by a car and killed Friday night in Northern Virginia, authorities said. The dog was also struck and killed by a different car.

Another pedestrian was killed Friday afternoon in Prince George’s County and a third was critically injured late Friday night near Thurgood Marshall Baltimore Washington airport, authorities said.

The man killed in Northern Virginia was struck on Spriggs Road in the Woodbridge area of Prince William County, county police said.

He was identified as Erwin Jose Valdez Perez, of Woodbridge, and police said that he was trying to cross an unlit section of Spriggs Road about 7:08 p.m. roughly an hour after sunset.

“It is believed the pedestrian was attempting to catch his dog that had run away,” Prince William police said in a statement.

Police said Valdez Perez was struck in the 14300 block of Spriggs, which is near Lindendale Road, by a car that was headed south on Spriggs.

The motorist was not at fault, police said.

The dog was hit in the northbound lanes, the police said.

In the Prince George’s County incident, county police said a 47-year-old man was killed about 2 p.m. Friday at New Hampshire Avenue and Sheridan Street in the Chillum area.

Police gave his name as William Padilla and said they had no address for him. Preliminary results of their investigation indicated that the death was the result of “pedestrian error,” the police said Saturday.

In the Friday night incident near the airport, Anne Arundel County police said a pedestrian was struck by a vehicle about 10 p.m. on a road which is on the eastern edge of the facility, in the Ferndale area of the county.

They said the incident occurred on Aviation Boulevard, near Allwood Drive. The pedestrian, who was not identified immediately, was treated at the scene, then taken to the University of Maryland Shock Trauma Center, the police said.

They said a preliminary investigation indicated that the pedestrian was in the roadway, outside any crosswalk, where no street lights illuminate the area.

According to police, the driver of the vehicle, which was headed south on Aviation was unable to avoid the pedestrian.

Police said a preliminary assessment indicated that the incident stemmed from pedestrian error.

The incident occurred at a point where a well known bicycle and pedestrian trail runs parallel to the southbound lanes of the boulevard.