Cornelius Petrus Jakobus van der Walt, 37, had ketamine levels in his blood above what would be considered impaired for driving, according to an autopsy.
Chayton Wiescholek died along with three others in an Arizona hot air balloon crash. His girlfriend, Kinsey Taylor, had jumped out minutes earlier for a planned skydive.
New video shows flames rising from the crash site of the Arizona hot air balloon that plummeted to the ground Sunday, killing four and landing another person in the hospital.