dr. husel's care.s had been admitted for a wide range of conditions, but attorneys for the families say all of them died after being given lethal doses of the potent drug fentanyl. >> sometimes i look at it and say "i hate you." >> reporter: from her doorstep in columbus, ohio, allison has a clear view of mount carmel. last year, paramedics took her 44-year-old troy there. he'd been in a truck accident and had trouble breathing. shortly after he arrived, the attending doctor, william husel, told her -- >> i'm 99.9% sure he is brain-dead. >> reporter: what alison says she didn't know is that her his care, her husband received what her lawyers described as a lethal dose of fentanyl. some three hours after arriving at mount carmel, troy allison was dead. >> after it was over, we go down to the parking garage. i looked at my daughter, and i said, what the -- just happened. she's like, mom, i have no clue. >> reporter: allison is now suing dr. husel and mount carmel hospital, alleging the drug was intention