Donald Markham was a 51-year-old Chicago Police sergeant who died on September 2, 2015. The Cook County medical examiner initially ruled his death a suicide, saying he shot himself in bed after a drunken argument with his wife, Dina Markham, also a Chicago police officer.

That conclusion was challenged after an FBI yearlong investigation. An FBI forensic pathologist, Scott Denton, concluded Markham’s death was a homicide, citing blood pattern evidence suggesting his arms were lifted after death and that the gun had been placed in his hand, indicating the body may have been moved post-mortem. The county medical examiner nevertheless maintained a suicide finding. Dina Markham was later found drowned in the couple’s bathtub in May 2017 before the FBI could interview her; her death was ruled an accidental drowning. The FBI probe closed without charges, and the Cook County state’s attorney and the Chicago Police Department inspector general continued reviews. Two officers were suspended after the inspector general cited failures in the original investigation.

Anyone with information about Donald or Dina Markham’s deaths is asked to come forward.