I'm pretty well versed with the Mallory & Irvine story, but the guy I was referring to was some eccentric who dissappeared and his corpse got caught up in a glacier. Other climbers have reported seeing it at different places and times since. Mallory's body has been stationary, resting in the same spot he fell in 1924.
Many bodies remain on Everest and are seen regularly. The effort to get them out is tremendous and they are usually left as memorial to their efforts.