A Texas judge has ordered a comprehensive psychological evaluation of a former nurse convicted of killing a toddler and giving an overdose to an infant who survived.

Genene Jones is charged with killing four other babies and awaits trial on a murder charge for the death of 11-month-old Joshua Sawyer in December 1981. Her attorneys requested the evaluation in the hope of supporting Jones' claims of diminished capacity because of strokes and her assertion that she hears phantom voices.

Authorities suspect Jones, who's 67, is responsible for the deaths of as many as 60 children. She's served decades in prison since her first murder conviction in 1984 and was to be released last March, but Bexar (bayr) County prosecutors obtained indictments charging her with murder in four other infant deaths.