South Dakota's highest ranking law enforcement officer is criticizing the state's prison system as officials open another investigation into a suspected drug overdose involving an inmate.

The South Dakota Department of Corrections announced in a Nov. 17 press release that 46-year-old Timothy Tyree died after being found unresponsive in his bed at Mike Durfee State Prison that same day. According to the DOC, Tyree was taken to a nearby hospital where he passed away.

The DOC's news release was followed shortly thereafter by a press release from South Dakota Attorney General Marty Jackley, who announced the Division of Criminal Investigation opened an investigation into Tyree's death.

DCI, an agency under the attorney general, has opened investigations into the deaths of seven prison inm

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