19 year old Joseph Burke-Monerville died from a gunshot wound to the head, a post mortem has shown.
The student, from the Islington area, died at about 11.10pm on Saturday. A second victim is in a serious but stable condition.
He had spoken on Facebook of his excitement about a planned holiday to Magaluf on the Spanish island of Majorca next week, which he said would be "a week 'off' stress".
He was a past student of Aloysius' Roman Catholic College in Highgate and Wesley High School in Otukpo, Nassarawa, Nigeria.
Police are appealing for information on two suspects - one black, one light skinned - seen running from the scene towards the Pembury Estate.
More top news
Police in Southwark are appealing to the public for help in finding a teenage girl missing from Bermondsey.
Over 40,000 people picked up their packs to take part in the annual marathon in the capital.
The boyfriend of reality TV star Ferne McCann has been arrested on suspicion of attempted murder following an alleged nightclub acid attack.