The 22-year-old sister of Boston Celtics star Isaiah Thomas died in a car accident Saturday morning in Federal Way, Washington, family friends told the Tacoma News Tribune.

The Celtics issued this statement on Twitter:

According to the News Tribune, Chyna Thomas died at the scene of an accident on the shoulder of the I-5 at around 5am Saturday.

Avery Bradley comforts Isaiah Thomas pre-game. Brothers.

Posted by NBA Buzz on Sunday, 16 April 2017

A Washington State Patrol spokesman said the car was being driven normally at first and then "all of a sudden, it started to drift very casually onto the left shoulder" and then hit a barrier, which "vaulted the vehicle head-on into the sign post".

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Chyna Thomas was reportedly not wearing her seat belt.

Isaiah Thomas, who is considered an outside chance for NBA Most Valuable Player honours, and the Eastern Conference top-seeded Celtics open their playoff series against the Chicago Bulls today in Boston.