ACAMPO (AP) – Authorities have released the name of the skydiving instructor killed over the weekend during a tandem jump in Northern California.

The instructor, 25-year-old Yong Kwon, was found Saturday with his hand on the lever for a backup parachute but it was never pulled.

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Also killed was 18-year-old Tyler Turner. Turner made the jump with three friends who landed safely.

Their bodies were found in a Lodi-area vineyard after someone reported that the skydivers hit the ground without an open parachute.

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It appeared the parachute did not deploy until after impact.

They had jumped from the Parachute Center, a popular skydiving school in the state’s Central Valley whose website declares it “one of the largest and oldest drop zones in the United States,” launched in 1964.

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Copyright 2016 The Associated Press.