While Robert Plant has lived majority of his life in the spotlight as one of the world's biggest rockstars, he's privately grieved the soul-crushing loss of his son for nearly five decades.

RadarOnline.com can reveal how the sudden death of the Led Zeppelin frontman's five-year-old son Karac nearly ended the legendary band and forever changed the singer's life.

Plant, who turned 77 on August 20, shared Karac with first-wife Maureen Wilson, who he married in November 1968. Article continues below advertisement

Plant's Son Suddenly Dies While He's on Tour

The Stairway to Heaven singer and Wilson welcomed their first child together, daughter Carmen, in 1968 followed by Karac a few years later in 1972.

At the time, Led Zeppelin found themselves at the top of music charts and one o

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