More legal issues for the two men accused of playing a role in the mysterious deaths of three Kansas City Chiefs fans last year ... TMZ Sports has confirmed they've just been sued.
Court records we obtained show Jon Harrington filed a wrongful death lawsuit against Jordan Willis and Ivory Carson in Missouri on Friday ... just days after authorities alleged the two contributed to his son David Harrington's death by supplying him with a lethal mix of drugs at a '24 Chiefs watch party.