How did Robert plant's son die?

Answer 1

in 1977 when Plant's only son, Karac, died of a stomach infection; his death inspired the magnificent "All My Love".

Tragedy struck again, three years later, when Bonham died on September 25, 1980, after a night of heavy drinking. On December 4, that same year, Led Zeppelin announced their breakup.

Answer 2

There is no indication that he has died as of this day June 20, 2009.

Especially since he donated a signed acoustic guitar to a local charity auction on June 19th. (see link below)

Answer 3

Robert Plant is alive.