A woman who fell from a Chatswood apartment building had reportedly earlier threatened to leave her boyfriend after finding out he was married to another woman.
The woman, 34, was found dead in Brown Street, Chatswood early on Monday morning.
A stand-off then ensued between the man and police, which lasted 12 hours while the woman's body remained in a police tent below until the area was secured at 7pm that evening.
The man has since been charged with assault occasioning actual bodily harm relating to an earlier incident with the woman. No charges have been laid in relation to her death.
The man and the woman had been dating for several weeks, while it is understood that the man was reportedly estranged from his wife and was not living with at the family home.