Tristan Thompson's mother died suddenly Thursday of a heart attack, according to multiple reports.

Andrea Thompson died in her home in Toronto, the reports said.

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

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

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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.

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