London ? The man suspected of driving a gas-laden Jeep Cherokee into a terminal at Glasgow Airport in June has died without being questioned or charged by police.

Kafeel Ahmed, 27, died Thursday at Glasgow Royal Infirmary, police said. He is suspected of being at the center of the car bomb attack, which occurred a day after two cars packed with gas canisters were discovered in central London.

Witnesses to the June 30 accident said Ahmed, an Indian engineer, set himself ablaze and struggled with police and passers-by who tried to put out the flames. He reportedly suffered burns to 90 percent of his body.

He was hospitalized five weeks, unconscious and under armed guard. A member of Ahmed’s medical team said last month there was little chance he would survive because his severe burns left him vulnerable to infection and organ failure.

The other man in the car, Iraqi doctor Bilal Abdullah, has been charged with conspiring to set off explosions “likely to endanger life or cause serious injury.”