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Tristan Thompson's mother died suddenly Thursday of a heart attack.

Andrea Thompson died in her home in Toronto.

Tristan Thompson with Cavs

Tristan Thompson of the Cleveland Cavaliers reacts against the New Orleans Pelicans during the second half at the Smoothie King Center Feb. 28, 2020, in New Orleans.  (Jonathan Bachman/Getty Images)

The 2016 NBA champion flew to Toronto to be with his family, ex-girlfriend Khloé  Kardashian along with him for comfort.

Kardashian, who has two children with Tristan Thompson, had grown close to Andrea.

Kardashian's mother, Kris Jenner, confirmed Andrea's death in an Instagram post Friday.

"I am so heartbroken by the sudden passing of Tristan’s mom, Andrea," Jenner wrote. "My thoughts, prayers and all of my love are with Tristan, Amari, Dishawn and Daniel. You were the most amazing, dedicated, devoted, and selfless mom and such a loving, kind, and fabulous grandmother. What a blessing you were to your family!!! I will miss you Andrea. I will miss your bright spirit and amazing light. Thank you for always praying for us and lifting us up and encouraging us along the way. Rest in peace beautiful angel."

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Tristan Thompson and Khloe Kardashian

Tristan Thompson and Khloé Kardashian pose for a photo as Remy Martin celebrates Thompson's birthday at Beauty and Essex March 10, 2018, in Los Angeles. (Jerritt Clark/Getty Images for Remy Martin)

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Thompson won his lone NBA title with the Cleveland Cavaliers in 2016 over the Golden State Warriors.

The 6-foot-9 forward is a free agent after spending last season with the Chicago Bulls and Indiana Pacers.

Tristan Thompson at concert

Tristan Thompson (Joseph Okpako/WireImage)

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He spent his first 10 seasons in Cleveland before stops with the Boston Celtics and Sacramento Kings.