Watch How to Be a Serial Killer for Free: How to Stream the Movie Online at 123Movies. . HOW TO BE A SERIAL KILLER is the story of Mike Wilson, a charismatic, educated, and articulate young man who has found his life's purpose in exterminating people. Mike is determined to spread his message about the joy of serial killing and recruits a lost soul named Bart to be his pupil. Mike leads Bart through the ethics of serial killing as well as teaching him various lessons in disposing corp