Question: Badlands was about a teenage serial killer who murdered how many people?
Sentence (from "Long Island serial killer"): Long Island serial killer (also referred to by media sources as the Gilgo Beach Killer or the Craigslist Ripper) is an unidentified suspected serial killer who is believed to have murdered 10 to 16 people associated with prostitution, over a period of nearly 20 years, and dumped their bodies along the Ocean Parkway, near the remote Long Island, New York beach towns of Gilgo Beach and Oak Beach in Suffolk County, and the area of Jones Beach State Park in Nassau County.
Relevant evidence: No