A Maryland man famous for an online video where he was stopped by police while wearing a Batman costume died after his customised "Batmobile" broke down along a state highway, police said on 17 August.

Leonard Robinson, 51, began wearing the suit for visits to children's hospitals, where he handed out small gifts bearing the logo of the comic book hero. Maryland state police said he was killed late on 16 August after his customised Lamborghini broke down on an interstate highway and stopped, partially in the fast lane.

Robinson, who was not wearing his costume at the time, had gotten out of the car and was checking the engine when another vehicle collided with his, according to authorities.

The driver of the other car, a 39-year-old man, was not injured during the collision and no charges have been filed, police said. A spokeswoman for the state police said an investigation into the crash will take about 30 days. Robinson had been pulled over in 2012 by state troopers, reportedly for driving without licence plates, and became an internet sensation after video of the incident went viral.