The host was known in Hollywood for his work in electronics and animatronics.
"We are heartbroken to hear this sad news about Grant. He was an important member of our Discovery family and a truly wonderful man. Our thoughts and prayers are with his family," said a statement from Discovery sent. at CNN.
No cause of death was available.
Former MythBusters co-host Adam Savage said on Twitter: "I'm lost. No words. I've been in two large families with Grant Imahara for the past 22 years. Grant was an engineer, a really brilliant artist and performer, but also such a generous, easygoing and gentle PERSON. Working with Grant was so much fun.
CNN contacted the Imahara agent for comments.
