An 18-year-old was fatally stabbed Saturday in South-East London after an altercation over mobile phones.
The victim was Robert Knox, who was at Metro Bar that night celebrating the end of filming on Harry Potter and the Half Blood Prince. Knox played alongside Daniel Radcliffe as Ravensclaw student Marcus Belby in the new film and had recently signed to appear in the sequel.
Only a week earlier, Knox had confronted the man and told him to stop stealing his friend's mobile phones. Several friends who intervened also received stab wounds and were treated for their wounds. Police and witnesses believe Knox was targeted because he was defending his friends.
This marks the 14th teenager murdered in London this year.
Friends and family members have been leaving flowers and small memorials at the scene of the crime this week.