"The rumor about Charlie Sheen is not true," the Wild Things star, 39, Tweeted. "He is alive and on his way over to see his daughters. Thank u all for your concern."
On Sunday, Twitter and various blogs were abuzz with a rumor that Sheen had died in a snowboarding accident. One such false report said the Two and a Half Men star, 45, "lost control of his snowboard and struck a tree at a high rate of speed."
Sheen and Richards divorced in 2006 and have two daughters – Sam, 6, and Lola, 5 – together.