MEMPHIS, Tenn. - A federal judge has denied a motion to suppress the confession made by a former prison guard charged with killing two postal workers in West Tennessee.

U.S. Senior District Judge Jon P. McCalla ruled today that the confession Chastain Montgomery made to law enforcement agents after his arrest is admissible at his April trial.

Montgomery is charged with killing Paula Robinson and Judy Spray during a robbery of the Henning post office in October 2010. Prosecutors say Montgomery and his 18-year-old son shot the women multiple times.

Montgomery was arrested at the scene of a shootout between his son and police in Mason in February 2011.

Defense attorneys argued Montgomery's confession should be suppressed because he wasn't provided a lawyer during questioning and his statement was coerced by investigators.