The warning signs before Army reservist Robert Card shot and killed 18 people on Oct. 25 in Lewiston, Maine, were glaring and abundant, and still, he was not stopped before he carried out the worst massacre in the state's history and then took his own life.
There are still many unknowns, but a harrowing question weighs heavy: Could one of the deadliest mass shootings in U.S. history also have been the most preventable?
Questions have swirled about Robert Card's motivations, who he was, how police found him and why, despite clear warning signs, he remained free and armed.
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