NBA Player Isaiah Thomas Mourns the Death of His Sister, 6 Years After Their Younger Sister Died in Car Crash

Thomas' sister LaQuisha died six years after their sister Chyna passed away in a tragic 2017 car crash

Isaiah Thomas is mourning the loss of his older sister LaQuisha, six years after their other sister Chyna died in a car accident.

Thomas, 35, announced LaQuisha's death on Wednesday, Nov. 20 on his Instagram Stories, per a screenshot from TMZ, and has continued to pay tribute to his sister in posts on social media.

The former Boston Celtics player wrote on Wednesday, "Ima miss you, big sis!!!" and "Damn, how you leave me too?"

"Two sisters gone!!!! This can't be real. I love and miss you, Queen," Thomas added on Instagram.

He also seemingly reacted to the news of his sister's death in a post on X (formerly known as Twitter) on Wednesday. Thomas wrote, "F---!!!!" and dozens of broken heart emojis in the post.

Related: NBA Star Isaiah Thomas Comforted by Teammate After Tragedy in Moving Photo

On Friday, Nov. 22, the athlete posted additional tributes to his sisters.

"How?? Why?? I don't like to question God but damn man," Thomas wrote on one Story. Over a photo of LaQuisha and Chyna, Thomas wrote, "How both of y'all gone? Like make it make sense man!!!"

An hour after that, he posted again to his Story, this time with a black background and simply adding a crying face emoji and a broken heart.

Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories.

In 2017, Thomas' sister Chyna died in a one-car crash in Tacoma. She was 22 at the time.

The point guard shocked Celtics fans that day when he suited up for the team's playoff game just one day after Chyna's death.

Thomas paid tribute to his sister by wearing sneakers that said, "Chyna, RIP Lil Sis" and ended up scoring 33 points for Boston in the 2017 postseason victory.

In a powerful image from that game, Thomas is seen being comforted by his teammate Avery Bradley as he's crying during pregame shootaround. The two athletes grew up together in Tacoma, Washington, before becoming NBA teammates.

After that game Bradley said, "I know tonight he was playing for his sister. He was playing for his family," according to NBA.com.

"We appreciate that as teammates. He is just an amazing basketball player and a better person, so I’m happy with the way he played tonight, and we just need to continue to fight for him."