Harris, who finished in the top 6 of the long running singing competition in 2014, reportedly suffered an apparent heart attack in his hometown of Jasper, Alabama, on Sunday (January 15) night, according to the relative.
An official cause of death has not been released publicly as of Monday afternoon.
"You sing 'cause you have to sing, not 'cause you want to sing. And I mean that in the deepest way. And that's why it's so believable and real," Urban told Harris at the time.
Harris also performed several other artists songs during his American Idol run, which included 'Waiting on the World to Change' by John Mayer; 'Free Fallin'' by Tom Petty; and 'Radio' by Darius Rucker.
The Alabama native was chosen by the judges to advance as a wild card in the semifinals after falling short of the votes necessary and advanced to the top 6 before facing his final elimination.
Harris released his debut single, 'In Love,' as part of a non-album release in 2019.
No additional details were made available as of Monday afternoon.