Just minutes following reports that Miller, 26, died Friday from "an apparent overdose", Instagram comments and tweets flooded in blaming Grande for the tragedy. "Our thoughts are with his family, friends, and fans", according to SXSW on Twitter.
Miller was arrested on DUI and hit-and-run charges in Los Angeles in May.
A van from the coroner's office was also parked outside before driving away with the musician's body.
Miller battled with substance abuse issues for years and became more of a battle after his breakup with Ariana Grande.
Mac has had a roller coaster year following his split from Ariana Grande.
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In May, he was arrested for driving under the influence (DUI), after totalling his auto and fleeing the scene.
"But beyond helping me launch my career he was one of the sweetest guys I ever knew. I'm a human being", Miller told Zane Lowe on Beats 1 on Apple Music in July. Best thing that could have happened.
Miller was set to start a tour next month to promote "Swimming", with a planned first date of October 27 in San Francisco.
Mac, who was born in Pittsburgh, Pennsylvania, had been having trouble with substance abuse recently following his break up from Ariana. I was so fked up all the time it was bad.
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But suffice it to say that Trump fulminating is not at his level-headed best. "You know I'm very open to you". Dao did not rule out publishing another such piece from a Trump administration official in the future.
Acknowledging the close proximity of the plane incident and the auto crash, the musician took to Twitter soon after and wrote: 'God must hate me lol'. He has talked about having a bar mitzvah and celebrating Jewish holidays growing up.
In his song "S.D.S", he describes himself as a "Jewish Buddhist tryna consume the views of Christianity".
United States rapper Mac Miller has died, reportedly due to an overdose. "I can't wait to know and support you forever and I'm so proud of you!" Then you're like, 'Well, I could just be high and have a whole adventure in this room.' It kind of f**ks you up when you have a bunch of money because if you try a drug and like it, you can buy a lot of it.
Rappers like J Cole and Chance the Rapper took to Twitter to wish Miller peace in his final resting place, while some fans posted about what an inspiration he was to them in life.
"Mac was a hugely gifted and inspiring artist, with a pioneering spirit and a sense of humor that touched everyone he met", Tom Corson, Co-Chairman and COO of Warner Bros.
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He later posted videos showing himself verbally confronting a CNN reporter as well as Republican Senator Marco Rubio in a hallway. Twitter is permanently banning right-wing conspiracy theorist Alex Jones and his " Infowars " show for abusive behavior.