Cult singer-songwriter Daniel Johnston has died aged 58.

The American musician passed away following a heart attack, Johnston's former manager Jeff Tarkakov told The Austin Chronicle newspaper.

Despite battling chronic mental illness, Johnston had an influential career as a singer-songwriter.

He was a significant figure in the lo-fi and alternative music scenes after rising to underground fame in the 1980s.

Johnston became known to a wider audience when Nirvana's Kurt Cobain started wearing one of his t-shirts around 1992.

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In 2005, Johnston was the subject of the powerful documentary The Devil and Daniel Johnston.

Fans admired Johnston for his simple, sincere and childlike music.

High-profile artists including Beck, Flaming Lips, Yo La Tengo, Death Cab for Cutie and Eels have covered his songs.

Tributes have been paid to the late singer-songwriter on Twitter.

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