A state investigation into the death of an inmate at the jail in Bismarck has found no wrongdoing on the part of staff.

Forty-seven-year-old Mike Lang died in a hospital on Sept. 13 after suffering a medical problem at the Burleigh-Morton County Detention Center on Sept. 6 and going into a coma. The state medical examiner ruled heart disease as the cause of death.

Lang's family members said he also had pneumonia, low blood sugar, a cut on the back of his head, a broken nose, broken cheek bones and broken ribs.

The Bismarck Tribune reports that a state Bureau of Criminal Investigation review found no concerns with the jail.

Lang's widow says she still believes Lang was beaten by another inmate, likely for his criminal charge of luring minors.