Los Angeles Police Department said it was called to a "death investigation" at an address in the Valley Crest area of north Hollywood at 11.50am.
After they put an end to their relationship, Ariana posted on Instagram the following statement: 'This is one of my best friends in the entire world and favorite people on this planet - Malcolm McCormick. His official cause of death will be determined by the Los Angeles Coroner after a toxicology test.
It was released in November 2011 and debuted at number one on the US Billboard 200 chart, becoming the first independently-distributed album to top the charts since Tha Dogg Pound's Dogg Food in 1995.
Miller was set to start a tour next month to promote "Swimming", with a planned first date of October 27 in San Francisco. Asked directly by DeGeneres if she was happy with Miller, she said, "Yes".
Miller's death comes several months after he ended a high-profile, two-year relationship with pop superstar Grande, who was often seen as the inspiration for his songs.
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The pair dated for nearly two years and recorded multiple songs together, including "My Favorite Part and "The Way".
Grande's response serves as a timely reminder that we should not be holding her responsible for the actions of her ex, or even her current partner.
Ariana, who is now engaged to comedian Pete Davidson, made it clear after their break up that his substance abuse had played a part in the breakdown of their two-year romance. I just don't wanna be on Instagram anymore, "he said at the time". "I will continue to pray from the bottom of my heart that he figures it all out".
Miller has been open about his trouble with substance abuse including an addiction to powerful cough syrup - known on the street as purple drank.
"I just always thought that he was just, I guess, a bit more level-headed or something like that, and the music that he stood for, I find it really hard to believe [that he's gone]", said Yasmine Degnan, another fan. You feel real emotion because you've been suppressing it forever. Rest easy, Mac. We love you so so so very much'. In May of this year, the "Self Care" rapper was arrested for DUI and hit and run.
"He was there for her in her time of need after Manchester, and she will always love him for that". That's fine, that's good, that's life.