Irwin Rivera is said to have snuck into the bedroom.

The 31-year-old stabbed his two sisters several times.

Crime scene: Boynton Beach, Florida.

The murder weapon of the experienced UFC fighter: a knife with an additional brass knuckle on the handle.

"A brass knuckle knife", so it is in the police report, which became public.

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Accordingly, Rivera inflicted multiple and serious injuries on the two women.

Both survived seriously injured with deep stab wounds on their arms, back and face.

One of the nurses told the police that they were staying with her brother Rivera in one of his guest rooms, and when they woke up, Rivera repeatedly stabbed her.

Rivera is said to have fled the scene and was then arrested by the police.

According to the police report, he confessed to breaking into his sisters' bedroom and stabbing them with a knife in their sleep.

Rivera told police that he believed he killed his sisters and that he did it because it was his destiny communicated to him by a "higher power".

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A photo that the police allegedly took after his arrest is circulating in various American media.

Rivera has psychological problems

In a statement, the UFC said it had investigated the "extremely worrying" situation.

As a precaution, the association announced that Rivera would not be offered a fight at this time.

"The UFC is aware of the latest incident involving Irwin Rivera and has received information from his management that he has behaved in a way that suggests mental health problems," the UFC said.

The UFC, short for Ultimate Fighting Championship, is an American mixed martial arts organization and the world's largest organizer and marketer of fights.

Rivera, whose fighting name is "The Beast", is still listed as an active fighter on the official UFC website.

He made his debut for the UFC in May 2020 and took his first win in August.

Rivera had his last fight on September 19th.

In a short questionnaire on the website he answers the question what it means to him to fight in the UFC: “The world!

I have to make my family proud and show them that anything is possible. "