State police say a truck driver was watching pornographic movies on his laptop computer when his rig struck a disabled car on the New York State Thruway near Buffalo last month, killing the driver.

Thomas Wallace of Brook Park, Ohio, was arrested Tuesday. He's been charged with second-degree manslaughter in the death of 33-year-old Julie Stratton, a mother of two from the Buffalo suburb of Snyder.

The 45-year-old was being held in Genesee County Jail on Wednesday. It was unknown whether he had an attorney.

Investigators say Wallace also violated federal trucking rules by sleeping no more than four of 27 hours before the crash. Stratton's car was struck soon after she called 911 to report she'd hit a deer east of Buffalo.