Conor McGregor reacts to singer Sinead O'Connor death: 'The voice of an Angel'

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UFC superstar Conor McGregor paid tribute to Sinead O'Connor in a touching tweet on Wednesday after learning of the Irish singer-songwriter's death. She was 56.

Reactions poured in from across the world on Wednesday. UFC champion and fellow Irishman Conor McGregor took to Twitter to pay tribute to the late singer. 

McGregor described O'Connor's voice as "iconic" and wrote that he was "Gutted" in a quote tweet of a video from UFC 189, accompanied by a broken heart.

"The world has lost an artist with the voice of an Angel. Ireland has lost an iconic voice and one of our absolute finest, by a long shot. And I have lost a friend. Sinead’s music will live on and continue to inspire! Rest In Peace, Sinead you are home with your son I am sure." McGregor wrote in a tweet accompanied by photos of him with O'Connor.

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Sinéad OConnor was discovered at a young age when drummer Paul Byrne heard her sing a cover of Barbra Streisands "Evergreen." Just a few years later, she released her first album, "The Lion and the Cobra," in 1987.  (Stacia Timonere/Getty Images)

The pictures in the tweet appeared to be from O'Connor's 2015 performance where she sang during McGregor's walkout before his featherweight title fight with Chad Mendes.

The proactive Irish singer-songwriter who rose to stardom in her mid-20s when she burst onto the music scene with her hit "Nothing Compares 2 U."

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"It is with great sadness that we announce the passing of our beloved Sinéad," the singer’s family said in a statement