Samantha Mathis was with her boyfriend, River Phoenix, when he died on October 31, 1993, of a drug overdose outside the famous Viper Club in Los Angeles.

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

"I knew something was wrong that night, something I did not understand," said the actress of "American Psycho" in an interview with The Guardian of Great Britain. "I did not see anyone doing drugs, but he was drugged in a way that he did. I feel uncomfortable, it was over my head."

Mathis said that she and Phoenix were with their brothers Leaf (now known as Joaquin) and Rain, and they were only stopping at the nightclub, which was partly owned by Johnny Depp. But the musician Phoenix changed the plans.

"He told me:" Oh, there are people playing music tonight at the club that wants to play with them, it's okay, right? ", Mathis recalled. "Forty-five minutes later, he was dead."

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Mathis has never spoken of death, when she and Phoenix were only 23 years old, "Except my therapist," he said in the interview. But the actress saw for the first time the last film that Phoenix completed before she 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 he came out of the Viper Room bathroom and saw what he thought Phoenix was in a fight with another man, and the two were pushed out of the side door of the club by a goalkeeper. After that, she saw Phoenix fall to the pavement in convulsions.

"What have you done? What are you doing?" Mathis said that he shouted at the other man, who replied: "Leave him alone, you are ruining his height".

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

Mathis remembered the actor as "sensitive and obsessive, he felt things in his heart very deeply."

"I'm looking at a picture of him now, oh wow …" said Mathis in the telephone interview. "I think if River were still here, I think he would be acting, directing, saving the environment, just living and going out, Oh God, not that it's nice?"

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