In October 2009, he was diagnosed with Osteosarcoma (bone cancer) in his tibia. After 6 months of surgery (10 surgeries), the cancer had come back and spread more.
On May 21st, 2010, his leg was amputated above the knee. Evan then went through 9 months of intensive chemo therapy and 2 lung surgeries.
But Evan wanted to continue tap dancing. This video is one of his first attempts after he healed up enough to try out his new peg leg.