A post mortem examination has found that a man whose body was found in north London on Sunday died of natural causes.
A teenage girl had been bailed after being held by police on suspicion of murder following the discovery of the body of the 50-year-old man.
No action will now be taken, Scotland Yard has confirmed.
The 16-year-old is believed to be related to the victim John Hughes, whose body was found at an address in at 1330 BST on Sunday.
She was arrested hours later.