A 14 year-old boy and 25 year-old man arrested on Thursday, May 13 on suspicion of conspiracy to commit murder have been released under investigation.
The probe was launched after police were called to reports of shots being fired in Gillett Square just before 1am on May 8.
Officers attended and found 31-year-old Patrick seriously injured.
He was pronounced dead at the scene. The next of kin have been informed and formal identification has taken place.
A post-mortem examination on May 11 confirmed the cause of death as gunshot injuries.
Det Insp McDonald said: Patrick was attacked in Boleyn Road, N16, in the early hours of Saturday, May 8 and, at the time, I believe there may have been a number of people around who may have seen or heard something.