Miller, a platinum-selling USA musician and the former partner of Grande, was found unresponsive at his home in Los Angeles on Friday morning after a reported overdose.
Shortly after they parted ways, Grande responded to a fan on Twitter who criticised her for dumping him and said their relationship had been "toxic".
News. They said, "Malcolm McCormick, known and adored by fans as Mac Miller, has tragically passed away at the age of 26".
After Grande and Miller's split, the rapper was arrested and later charged with two counts of driving under the influence in August following a May DUI arrest in Los Angeles, California. "There are no further details as to the cause of his death at this time".
The couple split after almost two years of dating in early May.
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A Syrian man walks past a stall in the rebel-held northern Syrian city of Idlib's central Clock Square on September 6, 2018. Those remarks capped a week of rising USA rhetoric opposing the Idlib operation.
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That he was battling addiction and struggling with depression was brought to light in his final interview with Vulture that was published Thursday.
Sources claim there was no "obvious" evidence of drug use at the scene, but toxicology tests have been ordered to determine if substance abuse played a part in his passing. Let's rise above the negativity and keep Miller's family, friends, and Ariana in our prayers.
Tributes to Miller came from rappers including Wiz Khalifa, a fellow Pittsburgh artist who took Miller under his wing.
Her message was simple: "Rest easy, insane kid".
Three time Grammy award-winning rapper and songwriter Chance The Rapper said: "I don't know what to say Mac Miller took me on my second tour ever".
He talked about his quest for sobriety in a 2016 Vogue profile, saying, "I'm just changing how I live life, my state of mind..."