The 28-year-old man was arrested by detectives at Heathrow Airport on Wednesday, 27 October on suspicion of murder and two counts of attempted murder; he remains in custody.
An investigation was launched after police were called at 10.31pm on Tuesday, 21 September to reports of a man shot on Green Lanes, close to the junction with West Green Road, N8.
Sharmake Mohamud, 22, was found at the scene with gunshot injuries and despite the efforts of paramedics, he was pronounced dead at the scene.
Two other men – aged in their 20s and 30s – received gunshot injuries as a result of this incident; both received hospital treatment before being discharged.