This is a probing portrait of the four doctors in the United States still openly performing third-trimester abortions in the wake of the 2009 assassination of Dr. George Tiller in Wichita, Kansas — and in the face of intense protest from abortion opponents. It is also an examination of the desperate reasons women seek late abortions. Rather than offering solutions, “After Tiller” presents the complexities of these women’s difficult decisions and the compassion and ethical dilemmas of the doctors and staff who fear for their own lives as they treat their patients. Official Selection of the 2013 Sundance Film Festival. By Martha Shane and Lana Wilson.