Malcolm James McCormick, more commonly known by his stage name Mac Miller, died following recent trouble with substance abuse. 

American music star Mac Miller, a former boyfriend of US singer Ariana Grande, has died of an apparent overdose, aged 26. 

The rapper, whose real name was Malcolm James McCormick, had experienced recent trouble with substance abuse, TMZ reports

He was due to go on tour next month with his latest album "Swimming," which was released on August 3. 

Miller had previously explored his Irish roots in the second season premiere of his reality show, "Mac Miller and the Most Dope Family," bringing his crew on a trip to Ireland as the opening act for Lil Wayne’s tour.  

After exploring the country, he could be seen jumping about some Irish traditional musicians with his acoustic guitar. 

Tributes are already pouring in for the rapper:

I dont know what to say Mac Miller took me on my second tour ever. But beyond helping me launch my career he was one of the sweetest guys I ever knew. Great man. I loved him for real. Im completely broken. God bless him.

— Chance The Rapper (@chancetherapper) September 7, 2018

Rest In Peace to the great soul Mac Miller

— J. Cole (@JColeNC) September 7, 2018

Devastating news to hear about another young person overdosing...this time losing their life. RIP Mac Miller, gone far too soon. 🙏🏼😓

— Victoria Justice (@VictoriaJustice) September 7, 2018

Unreal. So sad. RIP Mac Miller ❤️

— Shawn Mendes (@ShawnMendes) September 7, 2018

Mac Miller performs on the Camp Stage during day 1 of Camp Flog Gnaw Carnival 2017 at Exposition Park on October 28, 2017, in Los Angeles, California.Rich Fury/Getty