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Demi Lovato's rep has confirmed that the 20-year-old singer's biological father Patrick Lovato has died.

Demi has yet to release a statement on his passing, and it's no secret that the two had a rocky relationship. Patrick was the subject of her 2011 song, "For the Love of a Daughter," and when Demi went to rehab in 2010, her estranged father spoke to the media trying to get through to her.

In 2009 Demi told the New York Daily News, "The last time I talked to him was two years ago. You try to have faith in somebody, even when you're the last person that believes in him. But when somebody lets you down after you've been the only one there for them, and so many times, you don't know what else to do ... I had to cut off all connection. It was hurting me too much."

In October of 2011 Patrick spoke to Radar and revealed that he was ailing from cancer and still trying to reach his daughter. “It is not like I want anything from her, all I want is her love,” he told the site.

Demi's mom Dianna De La Garza tweeted, "Thank you for the outpouring of love and prayers. Y'all are amazing!" while Demi's older sister, Dallas, 25, wrote, "Rest in peace daddy I love you."