Charlie Sheen's ex-wife Denise Richards 'has known the actor has been HIV-positive for years'

Charlie Sheen's second ex-wife Denise Richards allegedly knew he was HIV-positive for years, US reports claim.
Sheen - who has been revealed to be the Hollywood actor who has the infection, according to a major US website - was married to Denise, 44, for four years. The pair, who are parents to daughters Sam, 11, and Lola, 10, divorced in 2006. 
A source claimed to US Weekly that the actress knew he had the disease and that her children are not HIV-positive. They added that he "got infected after they were together, four years ago or so."