Slender Man is a movie about four teenage girls who do a ritual to bring the long, thin, shadowy figure back to life. The girls then realize that the legend is true after one of them goes missing.
The movie is rated PG-13 and does not appear to be based on the 2014 stabbing in Waukesha.
The theater chain released a statement on why they chose not to play the movie:
"Like many people across the United States, Marcus Theatres was deeply concerned and saddened when the Slender Man phenomenon touched Southeastern Wisconsin in such a profound way, changing the lives of many families forever. After careful consideration, and out of respect for those who were impacted, we have decided not to play the upcoming Slender Man movie in Milwaukee and Waukesha counties. We will show the film at select other Marcus Theatres locations."