Gorgon I is an Inhuman. Gorgon was killed by his own power in Wolverine (3rd series) #31, but brought back to life in Secret Warriors #2.
Gorogn was killed by the White Sword in the Otherworld tournament in Cable (4th series) #6. He has reportedly been resurrected but hasn't been seen on-panel yet. Therefore, the extent of his changes after dying in Otherworld, like Rockslide, are unknown.