NEW BEDFORD — A Bristol Superior Court judge on Friday ordered the Department of Correction to preserve evidence related to the death of Aaron Hernandez, while an attorney for the former Patriots star’s fiancee said she may file a negligence lawsuit against state prison officials for failing to prevent his suicide.

Meanwhile, details emerged about two of the three letters left behind by the 27-year-old Hernandez, who was found hanging Wednesday in his cell at Souza-Baranowski Correctional Center.

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