A 1991 portrait of River Phoenix.(Photo: Nancy R. Schiff, Getty Images)

Samantha Mathis was with her boyfriend, River Phoenix, when he died Oct. 31, 1993, of a drug overdose outside Los Angeles' famed Viper Club.

Mathis is breaking her silence about the tragic death 25 years ago.

"I knew something was wrong, I did not understand," the "American Psycho" actress said in an interview with Britain's The Guardian. feel uncomfortable – I was in way over my head. "

Mathis said she and Phoenix were both known as Joaquin and Rain, and were then owned by the nightclub, then partly owned by Johnny Depp. But the Phoenix musician switched the plans.

"He said to me: 'Oh, there are some people playing music tonight in the club who want me to play with them – that's OK, right?'" Mathis recalled. "Forty-five minutes later, he was dead."

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They were just 23, "Except to my therapist," she said in the interview. Phoenix completed before he died, which she co-starred in, "The Thing Called Love."

It felt like a sign that "the universe wanted me to talk about him."

Mathis said she was coming out of the room and was thinking about it in the future, and the two of them were pushed out of the club by a bouncer. After that, she saw Phoenix fall to the pavement in convulsions.

"What are you doing?" What are you doing? "Mathis said she shouted at the other man, who responded:" Leave him alone, you're spoiling his high. "

Phoenix had died from an overdose of cocaine and heroin before paramedics arrived.

Mathis recalled the actor as "sensitive and obsessive. He felt things on his heart very deeply. "

"I'm looking at a photo of him now, oh wow …" Mathis said in the phone interview. "I think if River is still here, I think it is acting, directing, saving the environment, just living and hanging out. Oh gosh, would not that be nice? "

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