Boston Celtics guard Isaiah Thomas is expected to attend his sister’s funeral on Saturday in Washington according to a report in the Boston Globe.

Chyna Thomas, the 22-year-old sister, died in a one-car accident on April 15, the day before the Celtics’ playoff opener in Boston against Chicago.

The Celtics look to close out their first round series against the Bulls in Game 6 on Friday in Chicago. If the Bulls force a Game 7 on Sunday, Thomas is expected to be in Boston for the series-deciding game, according to the Boston Globe.

Chyna Thomas was the daughter of Isaiah Thomas’s father, James, and stepmother, Lanita, according to the Boston Globe. When Isaiah Thomas was a teenager, he and Chyna would accompany their father early in the morning on Saturdays to work in a mission in downtown Tacoma, the city where Thomas was born and raised.