Five children died and at least 12 were hospitalized after the bus plowed into a tree and flipped over in the Tennessee city.
Walker, 24, now faces five counts of vehicular homicide, reckless endangerment and reckless driving.
“Based on witness statements and physical evidence, the defendant was driving the school bus at a high rate of speed, well above the posted speed limit of 30 mph,” his arrest warrant affidavit says.
“Mr. Walker lost control of the bus and swerved off of the roadway to the right, striking an elevated driveway and mailbox, swerved to the left and began to overturn, striking a telephone pole and a tree.”
Cook said she’s grieving for the families of the children killed — but said her son is also suffering.
“My heart of love is going out for all that was in harm’s way of God’s will,” she said. “Sending out mine and our condolences to every family that God touched yesterday in this horrible accident. And I am asking for compassion also for my son.”