In order to kill professional wrestlers with the Death Note, you have to know their Real Life name, in this case it was Eddie Fatu.
((Author's Note, July 2019: Umaga actually died in December of 2009, and this strip was published in July. I never saw it coming.))
((Author's Note, July 2019: Umaga actually died in December of 2009, and this strip was published in July. I never saw it coming.))