Police are still investigating a serious car crash near Donnybrook last month that killed a teenage boy and injured four others. The group was travelling in a Toyota Corolla along Knights Road in Paynedale just after 5pm on October 26 when the vehicle left the road and struck a tree. A 14-year-old boy and a 17-year-old girl were rushed to Royal Perth Hospital by helicopter. The boy remained in a critical condition with suspected brain injuries inside RPH’s intensive care unit for several days. He died in hospital as a result of his injuries. The Major Crash Unit is continuing its investigations and is appealing for anyone with dash cam or mobile phone footage to come forward. Witnesses are urged to contact Crime Stoppers on 1800 333 000 or crimestopperswa.com.au.