A man in his 20s has died of coronavirus overnight while at home in isolation in Sydney's south-west.
The man had not been vaccinated.
"Our deepest condolences to his family and loved ones," NSW Premier Gladys Berejiklian said.
"But it demonstrates again how this disease is lethal, how it affects people of all ages.
"We understand the death happened quite suddenly."
The man died at home while in isolation.
Chief Health Officer Kerry Chant said he was being cared for by the southwestern Sydney local health district.
"He was being followed up daily by nursing staff and suddenly deteriorated," she said.
"That death is also being referred to the coroner as I understand it."
Dr Chant said the man had complained of feeling "a little fatigued" before his death.
"I think that is important to understand that your health status can deteriorate and you can have sudden death with COVID infection."
Another person in the home who also has coronavirus has now been moved to hospital.
A second COVID-19 death was also recorded yesterday.
A woman in her 80s from Sydney's inner west died at Royal Prince Alfred Hospital.
NSW recorded 233 new cases of COVID-19 today.
