A 46-year-old man was killed early Saturday morning when his 1999 Toyota Camry ran a red light and crashed into a tow truck in Upper Darby, said Police Superintendent Michael Chitwood.

The accident occurred about 1:20 a.m. when the Camry, traveling west on Lansdowne Avenue, struck a AAA tow truck on Township Line Road, Chitwood said.

Paul McCullough, of Havertown, was pronounced dead at the scene. His 36-year-old female passenger, who was in the front seat of the Camry, was taken to an area hospital in critical condition, Chitwood said.

The preliminary investigation indicates that the Camry ran a red light, but it was not clear why, Chitwood said.

The truck operator, a 37-year-old Philadelphia man, was not injured, Chitwood said.