The sister of Boston Celtics guard Isaiah Thomas, Chyna Thomas, has been killed in a one-car accident in the state of Washington. She was 22-years-old.

Washington State Police say the accident happened about 5am early Saturday morning. The car drifted into the left shoulder of a highway and struck a large metal pole.

It is unclear at this time what Isaiah and his family plans are as the Celtics take on the Chicago Bulls in game one of the NBA playoffs tonight at 6:30pm at Boston Garden.