JACKSON, Wyo. (AP) — Investigators say a rescue helicopter turned slightly to the left before it went into a spin and crashed in northwest Wyoming, killing one person.

A National Transportation Safety Board report dated Thursday doesn’t establish the cause of the Feb. 15 crash. It says the helicopter was 100 to 200 feet above the trees when it began spinning.

Search and rescue volunteer Ray Shriver of Jackson was killed in the crash. The other two people aboard were injured: pilot Ken Johnson and Mike Moyer, a battalion chief for Jackson Hole Fire/EMS.

The helicopter was attempting to find an injured snowmobiler, Steven Anderson of Morris, Minn. He died of a broken neck after crashing into a tree.

Another helicopter will attempt to remove the wreckage Friday. Bad weather halted two previous attempts.

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