Glenn Russell Cawley, 55, was found dead in his Twin Falls, Idaho, home on March 12, 2015. Deputies responded after his estranged wife, Lillian Cawley, who was living in California, could not reach him. He had been killed by a shotgun blast to the back of his head.

Investigators identified Michael Southerland as a person of interest. At the time of the killing Southerland was romantically involved with Lillian; weeks after the murder the two moved into Glenn Cawley’s former residence. On October 28, 2015, deputies responding to a reported break-in searched the home and found multiple firearms in Southerland’s possession, including a sawed-off 12-gauge shotgun by his bedside. That weapon and the ammunition were described as consistent with the rounds used in Cawley’s killing. Southerland, a convicted felon, later pleaded guilty to federal gun charges and received a 42-month sentence, but no murder charge was filed.

The Twin Falls County Sheriff’s Office and the FBI described the homicide investigation as active and ongoing as of June 2016. Does anyone who knew Glenn, Lillian, or Michael have information that could help clarify what happened?