Officials said the deceased person was not vaccinated.

Harris County Judge Lina Hidalgo confirmed the death and tweeted: "Sad to report the first local fatality from the Omicron variant of COVID-19. A man in his 50’s from the eastern portion of Harris County who was not vaccinated. Please - get vaccinated and boosted."

She did not reveal the name of the person.

She also raised the COVID-19 threat level from yellow to orange.

Meanwhile, the Omicron variant causes over 73 percent of new coronavirus cases in the US, according to estimates posted Monday by the US Centers for Disease Control and Prevention, reports CNN.