Man breaks into home, terrorizes resident for hours before killing himself

Investigators have concluded that 30-year-old Jesse Cook of Central Falls, Rhode Island, committed suicide after breaking into a home in Warner, New Hampshire and terrorizing the resident there for hours. But they still don't know why Cook broke into the man's house.
Cook didn't have drugs in his system, investigators were unable to identify any mental illness, friends said he had never behaved violently, and he had no criminal record.
Yet one day Cook stole a car in Providence in an armed carjacking, drove to New Hampshire, and kicked in the cellar door of 82-year-old Gordon Smith. Cook terrorized Smith throughout the night, acting "paranoid and erratic." In the morning, while the two were in the kitchen, Cook put a .40-caliber semi-automatic handgun to Smith's head. But after Smith told Cook he would spend the rest of his life in prison for killing him, Cook took Smith's hand "and placed it on the gun with his own hand, pointed the gun at his own head, and the gun discharged."
Investigators were unable to determine where Cook got the gun. The gun was traced to a consignment shop in Louisiana but investigators were unable to trace it from there.