Detective Inspector John Marriott from the Met s Serious Crime Command, who is leading the investigation, said: I understand how daunting it can be to come forward after such a terrible crime but investigations like this rely on the bravery of witnesses who find it in themselves to do so.
“My officers are here to provide whatever support we can to anyone who is willing to tell us what they know.
“Sami’s family have been devastated by the senseless loss of their son. For three years they have had only questions, but no justice.
Sami s father Samer urged the anonymous caller to be a brave person and set the record straight saying You know who you are and you have a choice .