Derek McAllister, 55, was found by police officers after being assaulted in Finchley on 30 December.
He was taken to hospital where he died on 13 January and a murder inquiry has begun, a Metropolitan Police spokesman said.
Police said a 32-year-old man has already been charged with grievous bodily harm. A post-mortem examination is due to take place later.
A man has died after being stabbed in north London last month.