Police allege the incident began when another male patient in the hospital grabbed and assaulted two women, aged 63 and 58, on January 4 about 3am.
Officers allege the man then confronted and punched an 80-year-old woman.
“It’s further alleged the man then choked the woman and hit her head against the wall, causing her to lose consciousness,” NSW Police said in a statement.
“The elderly woman remained in hospital in a critical condition before dying yesterday.”
The man was arrested and, once medically cleared, charged with cause grievous bodily harm to person with intent, choke person intend to commit indictable offence, intentionally choke person with recklessness and assault occasioning actual bodily harm.
He has been remanded in custody and is due to face Burwood Local Court at the end of this month.