A woman may have had a heart attack just before she lost control of her car Tuesday and veered into oncoming traffic. She was killed in a head-on collision.

Killed was:Joyce Horne, 60, address unknown.

Witnesses saw the woman slumping down on the steering wheel just before the 11 a.m. crash. Her car slammed into a truck on 1300 East near 5400 South, Salt Lake County sheriff's deputy Peggy Faulkner said.

"She may have had a heart attack or something," Faulkner said. "Witnesses saw her leaning over the steering wheel right before she went into the path of an oncoming truck."