American physician George Tiller, one of the few doctors in the country who performed late-term abortions, was shot and killed by Scott Roeder, an anti-abortion activist.

George Richard Tiller was an American physician and abortion provider from Wichita, Kansas. He gained national attention as the medical director of Women's Health Care Services, which, at the time, was one of only three abortion clinics nationwide that provided late-term abortions.

Late termination of pregnancy, also referred to politically as third trimester abortion, describes the termination of pregnancy by inducing labor during a late stage of gestation. In this context, late is not precisely defined, and different medical publications use varying gestational age thresholds. As of 2015, in the United States, more than 90% of abortions occur before the 13th week, 1.3% take place after the 21st week, and less than 1% occur after 24 weeks.

On May 31, 2009, George Tiller, an American physician from Wichita, Kansas, who was one of the few doctors in the United States to perform late terminations of pregnancy, was murdered by Scott Roeder, an anti-abortion extremist. Tiller was shot to death at pointblank range during a Sunday morning service at his church, Reformation Lutheran Church, where he was serving as an usher. Tiller had previously survived a murder attempt in 1993 when Shelley Shannon shot him in the arms.

Anti-abortion movements, also self-styled as pro-life movements, are involved in the abortion debate advocating against the practice of abortion and its legality. Many anti-abortion movements began as countermovements in response to the legalization of elective abortions.