By ADRIAN SAINZ
MEMPHIS, Tenn. (AP) - Federal prosecutors say a former prison guard charged with killing two Tennessee post office workers planned to escape from custody by attacking a U.S. Marshal.
In court documents filed Friday, the U.S. attorney's office in Memphis said Chastain Montgomery collected plastic trays from which he intended to make a "shank" in his cell at the federal detention center in Mason.
Prosecutors said Montgomery planned to attack a Deputy U.S. Marshal while being transported to Memphis for a court appearance. Montgomery allegedly attacked a corrections officer when found with the materials.
Montgomery has pleaded not guilty to fatally shooting Paula Robinson and Judy Spray while robbing the Henning post office with his 18-year-old son in October 2010.
The government is seeking the death penalty at trial. No date has been set.
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