Two young boys had powerful painkillers and a sleep-inducing antihistamine in their blood when they were found dead, along with their mother, in a minivan parked behind a shuttered Lone Tree store last month in what has been ruled a murder-suicide.

The Douglas County Coroner’s Office said Friday that Jennifer Marie Laber, 38, died from a self-inflicted gunshot to her head and that 3-year-old Adam and 5-year-old Ethan both were shot in the neck.

The three were found dead Nov. 30 in the secluded loading dock area of a vacant Sports Authority store as law enforcement from across the metro area searched for them.

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Jennifer Laber, Adam Laber and Ethan Laber. (Douglas County Sheriff’s Office)