A coroner's jury has ruled that a Cheyenne baby who died while in the care of his mother's boyfriend on June 30, 2015 died of undetermined causes.

The jury, which was comprised of three Laramie County residents, heard nearly six hours of testimony from 16 witnesses during an inquest conducted Tuesday by Laramie County Coroner Ron Sargent.

According to witness testimony, Tyler Child was watching the 6-month-old boy (C. L.) and his 3-year-old sister (A. L.) on the night of June 30, when he called 911 to report that the baby didn't appear to be breathing.  An autopsy ruled the boy's cause of death as undetermined.

The coroner's jury deliberated for about an hour before reaching their verdict, which has no civil or criminal trial significance.

Child has been charged with manslaughter in the case and could face up to 20 years if convicted. His trial is scheduled for March 1 in Laramie County District Court.