The 40-year-old woman died from her injuries following the fall at Clarendon Court, Southsea, Portsmouth, on 12 February.
A 46-year-old man, from Southsea, who was arrested on suspicion of murder, has been released with no further action to be taken, police said.
Hampshire Constabulary added it was preparing a file for the coroner.
The death of a woman who fell from the window of a third-floor flat is no longer being treated as suspicious.