fiona cullum , 25 , provided a safe haven for hassan hussain as he and fellow murderer yassin james , 20 , were hunted by police for gunning down sabrina moss in the street on a night out to celebrate her 24th birthday .
cullum then lied to officers when quizzed about hussain after he was arrested in 2013 over the murder in kilburn , north west .
the old bailey heard the shooting was part of an ongoing rivalry between two gangs .