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Exclusive | Cause of death revealed for 22-year-old who died on LA-bound Southwest flight

By Ross O'Keefe2 min readNew York Post
Exclusive | Cause of death revealed for 22-year-old who died on LA-bound Southwest flightExclusive | Cause of death revealed for 22-year-old who died on LA-bound Southwest flight

Rain McMillen Walmsley, 22, died mid-air during a flight from Dallas to Los Angeles due to a fatal kratom overdose, according to the LA County Medical Examiner.

The cause of death for a 22-year-old man who died aboard a Southwest flight in August has been revealed.

Rain McMillen Walmsley died from the “combined effects of 7-Hydroxymitragynine and Mitragynine,” according to the Los Angeles County Medical Examiner’s Office. His manner of death is listed as an accident.

A Southwest Airlines plane landing at San Francisco International Airport.
A Southwest Airlines plane lands at San Francisco International Airport in San Francisco, Tuesday, Oct. 13, 2026. Anadolu via Getty Images
A view of the Los Angeles skyline.
A view shows the Los Angeles skyline on Wednesday, June 10, 2026, in Los Angeles, California. FIFA via Getty Images
Capsules of the herbal supplement kratom on a package.
Capsules of the drug Kratom sit on a surface in Miami, Florida, on Tuesday, May 10, 2016. Some states are banning the herbal supplement. Getty Images

7-Hydroxymitragynine and Mitragynine are compounds found in Kratom, a plant supplement that has drawn growing concern due to recent overdoses.

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