How One True-Crime Writer Started Solving Murder. Journalist Billy Jensen spent fifteen years investigating unsolved murders, fighting for the families of victims. Every story he wrote had one thing in common - they didn't have an ending. The killer was still out there. But after the sudden death of a friend, crime writer and author of I'll Be Gone in the Dark, Michelle McNamara, Billy became fed up. Following a dark night, he came up with a plan. A plan to investigate past the point when the cops had given up. A plan to solve the murders himself...