NAHA, Okinawa — A key prosecution witness failed to show at the second hearing for two Americans charged with a vicious mugging on Okinawa last fall.

The witness was to testify that he was in on the plot to rob Bryant White, 23, by luring him to a remote area on Hamahiga Island, but backed out at the last moment. That would have supported the prosecution’s contention that Marine Sgt. Michael Avinger, 30, and Darian Preston Daniels, 29, the husband of a sailor, conspired to rob White, cut his throat and leave him for dead.

Avinger and Daniels have been in Japanese custody since their arrests about a week after the Oct. 25 attack.

At their first hearing on May 1, both defendants pleaded not guilty to conspiring to rob and kill White, a former airman stationed at Kadena Air Base.

Daniels denied any involvement in the attack. Avinger admitted he cut White’s throat that night, but denied robbery was a motive.

The two allegedly took White’s wallet, which contained about $100, a cellular phone and a wristwatch. Then they allegedly threw him into some bushes and fled when a car approached.

A few minutes later, White, bleeding profusely, stumbled to a home several hundred yards away and sought help.

The next hearing in the case is set for June 5.

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