June 6, 2016 10:09 AM EDT

It’s a case that may come down to what the bird heard.

Martin Duram, 45, was shot and killed in his Michigan home in May 2015 in what police first thought was a double homicide. Duram’s wife, Glenna, had also been shot, in the head, but police realized an hour later she was still alive.

Investigators now list Glenna as a suspect in her husband’s death, suggesting she had tried to pull off a murder-suicide, according to reports obtained by NBC Affiliate woodTV. Glenna has denied the allegations and has not been charged.

However, family members say they may have a witness…

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