The South African paper Mail & Guardian reports that Leon Botha, a South African DJ and artist who collaborated with the rave-rap group Die Antwoord, died on Sunday, a day after he turned 26.

Botha suffered from progeria, a rare degenerative disease that causes accelerated aging, distorted features, and limited growth. According to Mail & Guardian, Botha was "the oldest documented person living with the disease, which usually has a life expectancy in the teens."

Botha most famously appeared in Die Antwoord's "Enter the Ninja" video, which you can watch below. He also opened early shows for the group, and he collaborated with the artist Gordon Clark on a photo series called ["Who Am I? Transgressions"](http://mg.co.za/multimedia/2010-01-14-transcend-and-transgress ""Who Am I? Transgressions"" ).