Demi Lovato misses X Factor photo shoot after estranged father Patrick ...

Demi Lovato's estranged father Patrick Lovato passed away over the weekend.

The 20 year old pop star's older sister Dallas Lovato confirmed the news on Twitter writing Rest in peace Daddy I love you on Saturday night.

It's unclear what caused his death but Lovato's 53 year old dad reportedly battled cancer in recent years.

Twitter via Patrick Lovato Demi Lovato s father Patrick Lovato passed away on Saturday. Lovato s father and mother divorced in 1994 and the singer has been estranged from her dad for years.

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The Skyscraper singer and Patrick Lovato had a rocky relationship since he and her mother Dianna De La Garza divorced in 1994. Lovato told the Daily News in 2009 that it had been years since she spoke to her father.

The last time I talked to him was two years ago she said at the time. 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.

ddlovato via Instagram Lovato judges singing competition X Factor alongside Paulina Rubio (left) and Kelly Rowland (center).

I had to cut off all connection she added. It was hurting me too much.

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In her song For the Love of a Daughter from her 2011 album Unbroken Lovato hints that her father may have had issues with alcohol.

Mike Pont/Getty Images X Factor team Simon Cowell Kelly Rowland Paulina Rubio and Demi Lovato.

It's a very personal song she later told the Daily Mail 'Oh father please father put the bottle down...' The lyrics are self explanatory about my relationship with my estranged father whom I haven't spoken to in five years. I wrote it when I was 16 and getting it out is like therapy.

While Lovato struggled with her own issues with bipolar disorder and self harm in 2010 her father attempted to contact her without success.

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MarioLopezExtra via Twitter With my TheXFactorUSA team Missing ddlovato today host Mario Lopez wrote. Lovato did not appear at the promotional photo shoot after learning her father had passed away on Saturday.

I love her so much and I just want her to call me he told Radar Online last year. This is the only way I can talk to her I try to reach her but it never works.

It is unclear whether the Give Your Heart a Break singer had spoken with her father before he died.

Lovato a judge on popular singing competition X Factor bowed out of a scheduled photo shoot Saturday after the news broke.

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My thoughts are with you Demi show creator Simon Cowell tweeted on Sunday.

My thoughts prayers are with you ddlovato Mario Lopez wrote sharing a photo of the judges posing without her. God bless you your family.

Scores of Lovato s fans took to twitter with messages for the singer encouraging her to stay strong like the tattoos sprawled across her wrist.

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