Sad news, according to TMZ, Charlie Sheen will reportedly announce later this week that he is HIV positive.

TMZ is reporting that actor Charlie Sheen will announce his diagnosis on the Today Show during an interview slated for later this week.

TMZ adds,

NBC touted the interview in a press release as Sheen making a "revealing personal announcement."

A tabloid report came out Monday claiming Sheen's been keeping the diagnosis secret for years. You've gotta imagine he'll address that report tomorrow morning on "Today."

I'll update this story as more details come out.