Extreme athlete Felix Baumgartner, the first skydiver to fall faster than the speed of sound more than a decade ago, died in a crash Thursday along the eastern coast of Italy.

Baumgartner, who was known as "Fearless Felix," was most known for his 2012 skydive that broke the sound barrier. The stunt was part of the Red Bull Stratos project. Baumgartner partnered with the company in an attempt to record the highest-ever skydive.