Juice WRLD allegedly suffered a fatal overdose when he swallowed painkillers in an attempt to hide them from the feds.

Law enforcement sources tell TMZ that the pilot who was flying the rapper’s private plane from Los Angeles to Chicago on Sunday alerted authorities that Juice and his crew had weapons on the plane. When they landed, FBI and FAA agents were waiting for them.

At some point after the jet landed, Juice was reportedly seen swallowing several Percocet pills in what could have been an attempt to hide them. The pills may have contributed to his death.

The Cook County Medical Examiner’s Office performed at autopsy on Monday, but additional testing, including toxicology, cardiac pathology, and neuropathology, is still needed before an official cause of death can be determined.

Paramedics spent 40 minutes treating the rapper after he suffered a seizure before transporting him to a nearby hospital at 2:55 a.m. Doctors pronounced him dead when they arrived at 3:06 a.m.

In addition to pills, feds seized 70 pounds of weed in vacuum-sealed bags that were stashed inside suitcases, along with three registered guns. Two of Juice’s associates were arrested for gun possession.