Erin Strecker
July 26, 2013 AT 07:03 PM EDT

Mark your calendar: What is sure to be one of the most controversial films of the year, After Tiller, will be released September 20.

A trailer for the documentary about the 2009 murder of late-term abortion provider Dr. George Tiller and his remaining colleagues was released Friday.

The movie’s official site explains:

The procedure is now performed by only four doctors in the United States, all former colleagues of Dr. Tiller, who risk their lives every day in the name of their unwavering commitment toward their patients. Directors Martha Shane and Lana Wilson have created a moving and unique exploration of one of the most incendiary topics of our time, and they’ve done so in an informative, thought-provoking, and compassionate way.

Check out the trailer below.

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