The incident happened on Oct. 30 just before 9 p.m. in the 100 block of Forrester Street SW near Martin Luther King Jr. Avenue SW.
D.C. police said George Blackwell, 67, was driving the Honda CRV westbound on Forrester Street and as he "passed the stop sign" to go onto Martin Luther King Jr. Avenue, he was hit by a Metro bus that was headed north on the avenue.
He was taken to a hospital with life-threatening injuries. He died Saturday, police said.
Blackwell lived in Southwest Washington and was also known as Hassan Naseef, according to police.
A passenger who was in the front seat of the Honda was treated on the scene for non-life-threatening injuries, police said. The Metro bus driver was not injured. It was not clear if there were passengers on the bus at the time of the incident.