Human remains have been discovered on the tiny island off Washington’s Puget Sound where an airline worker crashed an empty passenger plane he hijacked.

The Pierce County Medical Examiner’s Office confirmed Sunday that 29-year-old ground control agent Richard Russell died in the fiery wreckage — although they didn’t outright say that the remains were his.

Authorities also recovered the flight data recorder and components of the cockpit voice recorder from the wreckage of the Horizon Airlines plane.

On Friday night, Russell stole a commercial plane from Sea-Tac International Airport and performed a series of incredible aerial stunts, including loop-the-loops and several barrel rolls before crashing into the tick island forest.

Investigators have yet to determine whether the crash was deliberate or accidental — but in a 20-minute recorded conversation with an air traffic control agent, Russell said he planned to go “nose down and call it a night.”

He also admitted he had “a few screws loose” and called himself “just a broken guy” who would likely be disappointing the many people who loved him.

Russell, who went by the nickname “Beebo,” grew up in Wasilla, Alaska, but lived in Washington and worked for Horizon Airlines, a sister carrier of Alaska Airlines.

In a video posted on YouTube last December, Russell describes his life as a ground service agent, saying, “I lift a lot of bags, like a lot of bags, so many bags.”

None of his social media posts indicate he was studying to become a pilot, but he took many trips with his wife to far-flung locales including France, Mexico and Ireland.

In a website that appears to be for a college communications class, Russell writes that he met his wife, Hannah, in Oregon in 2010 and they were married one year later.

The pair owned and ran a bakery successfully for three years, he writes, until selling it in 2015.

In a statement, Russell’s family called him a “warm and compassionate man” and said they were in “complete shock” over the incident.

With Post wires