UPDATE: SUNDAY, 9.45am: A teenager charged over a fatal hit and run crash that killed a Hocking mother in Whiteman on Friday has been remanded in custody after appearing in court on Saturday.
It will be alleged Zachary Dexter Travis Smith, 18, was driving a Mitsubishi Magna when it partly crossed onto the wrong side of Gnangara Road while overtaking at about 6.30am on Friday.
Mother-of-three Abigail George-Kennedy was killed by a cement truck that careered into her when it was struck by the Magna.
After the initial impact, the Magna turned sideways and was T-boned by a white Holden Commodore travelling behind the truck.
It is understood Mrs George-Kennedy was returning home from dropping her husband at the airport when she was killed.
Mr Smith appeared in East Perth Magistrate's Court on Saturday charged with aggravated dangerous driving occasioning death, failing to stop and render assistance, failing to report a crash and stealing a motor vehicle.
Mr Smith was alleged to have stolen a Mitsubishi Magna sedan sometime on June 13 or 14 from a secure carpark in Subiaco.
The police prosecutor told the court the vehicle was unlocked and police allege Mr Smith found a spare ignition key kept in the car before driving away in the vehicle.
The prosecutor said it is alleged the occupants of the Commodore then helped Mr Smith out of the car before he fled on foot, jumping over a barbed wire fence into a pine forest plantation.
The prosecutor said forensic testing showed Mr Smith's palm print on the top of the Magna and his appearance matched a description given by one of the occupants of the Commodore.
He also said Mr Smith had admitted to police during questioning on Friday night that he had not slept since Tuesday and was coming down from a drug binge that saw him inject amphetamines.
In a further twist, the court was told the Mitsubishi Magna had contained military items including ammunition and body armour.
Police this morning said that all of these items had been recovered since the crash, including two NICO stun distraction grenades.
Mr Smith is also alleged to have unlawfully used a Hyundai Accent on May 9 without the consent of the vehicle's owner.
Magistrate Hamilton told Mr Smith her decision to assess whether his nominated home address in Banksia Grove would be suitable for home detention was not "indicative" that she would grant him bail.
She said the assessment would help alleviate her concerns of public safety in relation to Mr Smith's driving, drug use and the unknown location of the grenades.
Mr Smith was not required to enter a plea and is expected to appear via video link in Armadale Magistrate's Court on Friday, June 22.