Charlie Sheen's former personal assistant was among a "handful of people" who knew he'd contracted the HIV virus.
Steve Han began working for the Hollywood star in 2011 and has recalled how Sheen's erratic behaviour during a high-octane party led him to suspect something was wrong.
The 34-year-old PA explained that during the bash, Sheen cut his leg and instead of trying to make light of the graze, he screamed: "Don't touch my blood, don't touch my blood, I got this."
The outburst prompted Sheen's unnamed friend to recoil in shock - but for Han, it marked the first sign something was seriously wrong.
He told Daily Mail Online: "It was such a strange reaction, he seemed genuinely concerned that someone might actually touch his blood.
"We were partying in the party den, a room just off his bedroom, and we all blew his reaction off because we were in the midst of a wild night, but I knew deep down something was wrong, I could see it in his eyes.
"At the time I thought maybe he's got Hep C or something, but I never imagined it was much worse.
"I knew he was dealing with something major but couldn't put my finger on it."
Han also recalled the moment the former 'Two and a Half Men' star confided in him about his illness.
He said: "I remember I had got in to some drama with one of Charlie's body guards, he had been giving me a hard time and it upset me.
"That night Charlie took me to one side to ask what was wrong.
"We were sitting at his kitchen table and I unburdened myself and got a bit emotional, I told him all my problems.
"We were just being very honest with each other, I was explaining my feelings towards what was wrong with the body guard and he just started to talk about his problems and said life isn't perfect.
"Then he just came out with it, 'I'm HIV positive', he was so blasé about it.
"I was shocked. He was sad to have to tell me, he didn't want to tell me, he wanted to empathise with me.
"He was very strong about it, he said 'it's okay, don't cry, I'm not dying, things will get better.'
"He wanted to reassure me that he's got the right doctor and he was being looked after. For him it isn't a death sentence."