“Lover, Stalker, Killer” (**1/2 out of four) was an intriguing documentary about a mechanic (Ryan Avis) who tries online dating for the first time and met a psychotic woman (Jessica N. Johnson) who takes dangerous obsession and fatal attraction to the extreme and how it turned his life upside down. Grippingly told especially for anyone who’s been involved in the unpredictable (and unstable) world of online dating and maintains interest throughout but stops just short of hitting the mark. Never groundbreaking exactly but still overall worthwhile.