Authorities say a third prisoner was in a transport van when a husband and wife wanted for murder overpowered two guards and fled earlier this week.
U.S. Marshal David Gonzales told The Associated Press on Thursday that there was a male inmate on Monday when Blane and Susan Barksdale faked a medical emergency, prompting guards to pull off a Utah highway.
Gonzales says the prisoner stayed behind when the couple abandoned the van and the tied-up guards near a rural Arizona town.
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He told authorities that he did not want to be part of any escape.
The Barksdales were being transported to face murder charges in Arizona.
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