(Woodland, WA) -- The coroner's inquest into the death of an embattled former Oregon family who crashed off a California cliff last year is now complete. A Mendocino County, California jury concluded last night that each of the Hart family children died "at the hands of another," meaning their deaths were a homicide. The jury determined the deaths of their moms Jennifer and Sarah Hart were suicides. The jury returned its decision after less than an hour of deliberation and following a two-day inquest. Police say Jennifer Hart was drunk when she crashed the family's SUV off a cliff last March, killing her partner Sarah and at least five of their six adopted children. Fifteen-year-old Devonte Hart remains missing, but investigators say they have reason to believe he was inside the SUV at the time of the crash. Jennifer and Sarah Hart were being investigated for child abuse and neglect in Minnesota and Texas before they moved to Oregon and later Washington state.