George Tiller, a Wichita doctor who was one of the few doctors in the nation to perform late-term abortions, was shot to death on Sunday as he attended church, city officials in Wichita said.

Dr. Tiller, who had performed abortions since the 1970s, had long been a lightning rod for controversy over the issue of abortion, particularly in Kansas, where abortion opponents regularly protested outside his clinic and sometimes his home and church. In 1993, he was shot in both arms by an abortion opponent but recovered.

He had also been the subject of many efforts at prosecution, including a citizen-initiated grand jury investigation. In the latest such effort, in March, Dr. Tiller was acquitted of charges that he had performed late-term abortions that violated state law.

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