Sure. The movie is based on a true story. It aims to bring to light the chilling reality of such incidents and might have added fictional elements for dramatic effect.
In many cases, 'A Killer Among Us' on Lifetime does draw from true stories. The show might take some liberties for entertainment purposes, but the core elements have roots in reality.
Not necessarily. Just because it's said to be a true story doesn't mean it is completely factual. Check the details on Wikipedia for a clearer picture.