Jamison's booking agent, Sally Irwin, confirmed the news of the singer's passing to TMZ and explained that he had died of a heart attack at his home in Memphis, Tennessee.
The news also was reported by Jamison's Survivor bandmates, who released a message on their Facebook page expressing their shock and sadness.
The news comes as even more of a shock since Jamison had just performed with the band on Saturday night in Morgan, California, the New York Daily News reports. The singer was also about to embark on a tour with Survivor starting Sept. 12 in Parker, Colorado, according to the band's website. The band intended to visit several U.S. states, as well as Germany, Sweden, England and Scotland, but the fate of the tour is now uncertain.
Jamison joined Survivor at the height of its popularity, just after the band had released the hit track "Eye of the Tiger." Jamison replaced Survivor's original vocalist Dave Bickler after he was forced to leave due to polyps on his vocal cords.
Jamison had served as Survivor's lead singer since 1984. Some of his greatest hits include "I'm Always Here," the theme tune for the hit TV series Baywatch, which he co-wrote and sang, "Burning Heart" from Rocky IV, "Is This Love," "The Search Is Over" and "The Moment of Truth" from The Karate Kid.
Jamison previously left Survivor in 2006 to focus on a solo career, but he returned to the band in November 2011.
Our thoughts are with Jamison's family and friends during this sad time.
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