Charlie Sheen is set to talk to Matt Lauer on the TODAY show Tuesday morning, and the subject matter will reportedly be very serious.

TMZ is quoting sources close to the NBC show in saying that Sheen will reveal that he is HIV positive.

NBC has said that Sheen will make a “revealing personal announcement,” so that would definitely qualify.

It was the National Enquirer which first reported that Sheen was HIV positive. The tabloid said it was able to confirm the news after an “exhaustive 18-month long investigation.”

The Enquirer also suggested that Sheen has known about this for some time, so he’s been “having sex with multiple partners since learning his HIV status without informing them of his potentially deadly HIV infection.”

Those are some incredibly serious allegations, and it’s likely that Sheen will address them on TODAY if that is in fact what he plans on revealing.

TODAY is busy promoting the interview.

Tomorrow On TODAY: @charliesheen talks to @MLauer in a live revealing interview https://t.co/LfCMr7nvk7 pic.twitter.com/cjVcR5XP8j

— TODAY (@TODAYshow) November 16, 2015

Sheen hasn’t addressed the reports. He’s been quiet on Twitter since October 28th.