The Phelps's family has not released such information.
He isn't dead.
Michael Phelps Mom: Alive Dad: Alive
No, he is perfectly healthy and ready for London's games.
of course not! this is his sister michelle. my brother is alive and kicking!
Michael Brinton died in 2012.
Michael Bzdel died in 2012.
Phelps Phelps died on 1981-06-10.
Michael DeBose died on 2012-04-23.
Michael Sands died on 2012-04-06.
Michael Mussa died on 2012-01-15.