Jimi Jamison, frontman for the rock band Survivor, has died of a heart attack at age 63.

"The entire Survivor family is very shocked and saddened by the passing of our brother Jimi Jamison. Our thoughts, love and prayers go out to his family and friends," the band posted on Facebook.

Jamison's agent told TMZ that the rocker passed away from a heart attack in his home in Memphis, Tenn., on Sunday night (Aug. 31). The night before, he performed with Survivor in California at a show to benefit cancer research.

While the band is most well known for their hit 'Eye of the Tiger,' Jamison joined as the band's lead vocalist afterwards, and was the voice behind such songs as 'The Moment of Truth,' 'The Search Is Over,' 'Is This Love,' and 'Burning Heart' from 'Rocky IV.'

R.I.P., Jimi Jamison. Our thoughts are with his family, friends and band members during this difficult time.