Police inspecting the car after his arrest allegedly found a firearm in the vehicle.
The teenager and her parents had run from the car during the alleged theft and were not injured.
On Tuesday morning, Towle remained under police guard at Sunshine Coast University Hospital, having suffered injuries to his head and body.
He has been charged with 15 offences, including armed robbery, dangerous operation of a vehicle causing death, and drugs and explosives charges.
Towle’s case was mentioned briefly in Maroochydore Magistrates Court on Tuesday.
