A judge gave Wayne Couzens a rare whole-life tariff - one that only 60 other prisoners are serving.
The 48 year old ex-police officer falsely arrested his victim in Clapham in March before raping and strangling her.
Baroness Helen Newlove's husband Garry was beaten to death by youths in 2007 and is a former victim’s commissioner.
She says the coming weeks will be tough for Sarah's family.