Shadow of Fear(2012)

When Morgan Pierce quit his job after only 4 days at the coffee shop, Casey Cooper thought she had seen the last of her off-putting co-worker, but after Morgan starts calling Casey and watching her at work she has a feeling something is wrong. Morgan's behavior escalates as he begins to write letters and call her dozens of times a day. When he crosses the line, Casey must find the strength inside herself to stop living in fear. Based on a true story.