Stephen A Marshall "The vigilante Paedophile Killer" Marshall was driving through rural Maine under the cover of night with three guns by his side and a laptop with 34 names and addresses he’d found online. It was the early hours of Easter Sunday in 2006, and 20-year-old Marshall, a dishwasher from Cape Breton, Nova Scotia, was paying a rare visit to his father in Houlton, Maine, a town near the US-Canada border.

His father was asleep and had no idea that Marshall had taken his truck after quietly slipping out of a window. Around 3 AM, Marshall reached his first stop: about two hours southwest in the town of Milo, Maine.

Fifty-seven-year-old Joseph Gray was asleep in his living room, Marshall shot and killed Gray through the living room window. Over the next few hours, it’s believed that Marshall drove by at least four other homes,  ...