The man who hosted the ill-fated Kansas City Chiefs watch party that ended with three deaths is reportedly seeking addiction help in rehab -- and TMZ has learned more info about the deceased that could provide clues about what might've happened.
Jordan Willis -- who invited several friends to his K.C.-area home to watch the Chiefs play in early January -- is now seeking treatment for substance abuse -- with his attorney saying he "recognized that he had a problem with addiction" ... this in the aftermath of his three friends turning up dead in his backyard after a night of watching football .