A Navy investigation into last year's death of a SEAL during parachute training has cited errors made by supervisors as well as the relative inexperience of the 29-year-old man who was killed.

But the probe found there was no single cause or one person responsible for the incident.

Jason Kortz of Colorado plummeted to his death after his main parachute got tangled during a high-altitude jump in March 2015.

The San Diego Union-Tribune on Tuesday (http://bit.ly/1sGf9Jw) cited a Naval Special Warfare probe that found Kortz's body position was wrong when he exited the aircraft.

The top Navy SEAL, Rear Admiral Brian Losey, wrote that Kortz's superiors allowed the inexperienced parachutist to participate in a complex jump before he was ready.

SEAL officials say training has been changed to include a more gradual progression toward difficult jumps.

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Information from: The San Diego Union-Tribune, http://www.utsandiego.com