In 2009, a former tenant at Dellens west-end Toronto rental property who was engaged in a dispute with him before the Landlord Tenant Board at the timereported to police that she had found Millard and his friends tampering with the engine of her car the night before her hearing.
http://www.thegridto.com/city/local-news/the-mystery-of-dellen-millard/
All the time I would not believe DM to be guilty of murder or serial murder. Since the news of April 2014 I have changed my mind and I'm thinking, it could have been him and his pals.
The above quote I found notable and thought of Audrey's case.
Could it be, the perp/perps attempted no car theft but removing various parts? Audrey's age and stabbing and sexual assault perhaps doesn't fit at all, but I was encouraged by the following consideration:
Dellen Millard - SS - amdninjaboy - camaro forum - US cars etc.
Please, google yourself. Maybe, you are able to find much more.