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 ... according to Fox News.

Remember ... families of the three men raised the alarm after they hadn't heard from their loved ones for several days. Police showed up at Willis' house on January 9 and placed JW in handcuffs while he was just in his underwear -- though he was not arrested.

They found David Harrington, Ricky Johnson, and Clayton McGeeney dead at his home. A fifth man, Alex Waemer-Lee, attended the event but reportedly left the party early.

Now, it's interesting that Willis is heading to rehab -- because TMZ has done some digging that jibes with the notion that this tragedy may, perhaps, be drug-related after all.

For instance, we've learned that one of the men, Clayton, had a connection to pharmaceuticals which might shed some light. We've uncovered that McGeeney had an active pharmacist license which was issued last year and set to expire at the end of May 2024.

While we don't know if he was working at any pharmacy in particular or practicing pharmacology in any way at the time of his death ... we do know the license would allow him to work as a pharmacy technician if he so desired.

Another interesting fact ... David Harrington -- another one of the men who died -- was arrested back in Colorado in 2011 for possession of a Schedule II controlled substance ... although it seems he ended up with just a year of probation and paying some fines.

We don't know for certain what the substance was that resulted in Harrington's arrest, but Schedule II drugs in Colorado include opiates such as oxycodone and fentanyl, and other similar narcotics.

On the face of things, some of these facts appear to line up with what police have maintained since the beginning ... namely, that there's no evidence of foul play, and that for now, they don't suspect homicide either -- though, the investigation remains ongoing.

Alex Caprariello, a NewsNation reporter who's been chasing the story since the beginning, reported the families of the victims are meeting with the Platte County prosecutor to "discuss the ongoing investigation and possibility of criminal prosecution."