Los Angeles: Hollywood actor Charlie Sheen reportedly only discovered he is HIV-positive "long after" splitting from former porn star Bree Olson.

The 50-year-old, who was diagnosed with the virus four years ago, insists the former porn star ended their relationship via text message before doctors gave him his test results in 2011 even though she claims they were living together around the same time, reports femalefirst.co.uk.