Australia's New South Wales has reported 77 new cases of COVID-19 and one death in the 24 hours to 8pm on Saturday.
State Premier Gladys Berejiklian says the victim was a woman in her 90s who died at Sydney's Livepool Hospital on Saturday.
The woman was a close contact of another COVID-19 case and tested positive on Friday. It was the first COVID-related death in NSW in 10 months.
"When you get COVID, unfortunately those most impacted are those closest to you, and tragically we've seen one older person die and I want to extend my deepest condolences to their families and loved ones," Berejiklian told reporters.
She said people should expect Monday and the days following to be "much worse than we've seen today".
"I'll be shocked if it's less than 100 this time tomorrow of additional new cases."
On Saturday, NSW Health announced 50 community cases of COVID-19. Berejiklian had warned Sydney residents the worst may be yet to come.
"We can't stress enough the importance of not only following the rules but also realising the risk to the people who will suffer the most," she said on Sunday.
"If you don't worry about yourself, that's your decision - but think about your closest family members, your closest people in your life. They're the people that are most impacted."
NSW has now reported 566 community cases of COVID-19 since the current outbreak emerged in the suburb of Bondi in mid-June.