Battle was mentored by Cowell on The X Factor USA in 2011.
I am so sad to hear about the news Simone Battle has passed away. She was such a fun nice person. It's such a loss. Rest in peace Simone.
— Simon Cowell (@SimonCowell) September 6, 2014
Cowell tweeted: "I am so sad to hear about the news Simone Battle has passed away. She was such a fun nice person.
"It's such a loss. Rest in peace, Simone."
The singer's death was confirmed in a joint statement by Reign Deer Entertainment, choreographer Robin Antin, Kemosabe Records and RCA Records, which described her as an "exceptional young talent and human being".
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