Esports star Karel Asenbrener -- famously known as "Twisten" -- died at 19 years old on Tuesday ... shortly after he posted a chilling tweet that read nothing more than "Good night."
Twisten's gaming org., Team Vitality, made the heartbreaking announcement on Wednesday ... saying its "deeply saddened" by the "devastating loss" of its star.
"Our first thoughts and prayers are with his family and friends in this difficult time," the French esports team wrote in a statement. "Rest in peace Karel."
One of the organization's coaches, Harry "Gorilla" Mepham, said in a tweet that Asenbrener had died by suicide.