Editor’s note: An earlier version of this story stated Rivera was facing first-degree murder charges. It was based on erroneous information in the Palm Beach County Sheriff’s Office online arrest records. UFC bantamweight Irwin Rivera is facing charges on two counts of attempted murder after he was arrested and jailed Thursday in West Palm Beach, Fla. According to an ESPN report , Rivera was taken jailed just after noon ET on Thursday after being apprehended by the Boynton Beach Police Department. MMA reporter Eric Kowal   initially broke the news. According to an incident report obtained by ESPN, Rivera’s two sisters, age 22 and 33, were discovered with multiple stab wounds.