The man who hosted a Kansas City Chiefs watch party leading up to the tragic death of his three friends has checked into rehab,RadarOnline.com can report. Jordan Willis is “facing his addiction head-on,” a source close to his family said about the HIV researcher’s decision to seek professional help immediately after vacating his home and putting his belongings in storage. The insider said Willis, 38, realized he had a problem following the “shocking loss of three of his close friends under extremely tragic circumstances,” according to Fox News Digital. Ricky Johnson, 38, Clayton McGeeney, 36, …