Ex-model who got hooked on pain pills after contracting disfiguring virus is 'shot by boyfriend who killed cop before turning gun on himself'

A former model - who lost her looks and was left hooked on painkillers after getting a rare blood disease - is to be questioned by detectives after her boyfriend allegedly shot dead a police officer then tried to kill her and himself.

Traci Vaillancourt, 34, was allegedly shot in the back by her boyfriend Timothy 'Troy' Walker while sitting in their Volvo in Draper, Utah, just moments after he is accused of shooting dead Sgt Derek Johnson.

Walker then turned the weapon on himself and has been hospitalized alongside his long-term partner since. They are both in a critical condition. 

Police are waiting to speak to Vaillancourt to hear her account of what happened and to find out if she knew about her boyfriend's intention to kill.

Transformed: Traci Vaillancourt was a model in high school, left, before falling ill and becoming hooked on painkillers. She has been previously arrested for theft charges, pictured in her current mugshot right

Officers suspect the pair were on drugs when Sgt Johnson spotted their car parked awkwardly.
Speaking in response to the crime, Vaillancourt's sister Victoria King has revealed her sister's tragic demise from aspiring model and TV star to drug-addled homeless woman reliant on her violent boyfriend.

Accused: Timothy Walker allegedly shot Sgt. Derek Johnson dead before turning the gun on his girlfriend and himself 

After having her first child, Vaillancourt was diagnosed with a rare blood disorder called Hereditary Angioedema which made her face, throat and limbs swell, her sister told KSL.com.
She says her sister quickly became addicted to her pain medication after suffering four strokes before the age of 30.

'It just went downhill from there,' King told the broadcaster.
'I tried to get him away from her. She chose a different path. … He was bad news from the get-go, I knew it, and the two of them combined, and a loaded gun nonetheless, and strung out on drugs.'
'We tried and tried and tried to help her but you can't help someone who won't help themself,' she added.
King last saw her sister and Walker, 35, the day before the shootings and was left startled by his behavior.

'He got out of the car and he was hyper, showing me a gun that has a laser and a machete and knives,' she said.
The couple were trying to talk King into giving them cash - an event which wasn't unusual according to Vaillancourt's older sister.
Detectives are now waiting at Intermountain Medical Center, where the couple are being treated to question them about the shooting