A medical examiner ruled the cause of death as head trauma and the accident report noted that neither of them were wearing a helmet at the time of the crash.
Marlena Murray, 29, was indicted on criminal negligent homicide charges after her 2-year-old son, Josiah Meadors, drowned in a pond near their home in May.
Dr. Janaki Earla, 59, was arrested after the victim's mother reported his sexual advances towards her daughter to investigators, who later assumed her identity, leading to his arrest.
Quinton Simon was reported missing on Oct. 5 by his mother, Leilani Simon, claiming he last saw him inside his playpen. The mother was ordered by a court to pay child support a week before his disappearance.