The plane had made seven flights before the remains were discovered.
Autopsy results revealed the man had frozen to death, and an investigation is still underway to discover how the man ended up in the wheel well.
"According to a preliminary conclusion, the Afro-American man died from freezing. The man was apparently flying without a ticket," the Investigative Committee said on its website.
Many are wondering how airport workers could have missed such a thing for seven flights. Some have speculated that landing gear doors are typically closed while on the ground. Others said daily inspections should include opening up the landing gear doors.
2014: The Year in Music [PHOTOS]