WICHITA, Kan. — George Tiller, one of only a few doctors in the nation who performed abortions late in pregnancy, was shot to death here Sunday in the foyer of his longtime church as he handed out the church bulletin.

The authorities said they took a man into custody later in the day after pulling him over about 170 miles away on Interstate 35 near Kansas City. They said they expected to charge him with murder on Monday.

The Wichita police said there were several witnesses to the killing, but law enforcement officials would not say what had been said, if anything, inside the foyer. Officials offered little insight into the motive, saying that they believed it was “the act of an isolated individual” but that they were also looking into “his history, his family, his associates.”

A provider of abortions for more than three decades, Dr. Tiller, 67, had become a focal point for those around the country who opposed it. In addition to protests outside his clinic, his house and his church, Dr. Tiller had once seen his clinic bombed; in 1993, an abortion opponent shot him in both arms. He was also the defendant in a series of legal challenges intended to shut down his operations, including two grand juries that were convened after citizen-led petition drives.

On Sunday morning, moments after services had begun at Reformation Lutheran Church, Dr. Tiller, who was acting as an usher, was shot once with a handgun, the authorities said. The gunman pointed the weapon at two people who tried to stop him, the police said, then drove off in a powder-blue Taurus. Dr. Tiller’s wife, Jeanne, a member of the church choir, was inside the sanctuary at the time of the shooting.

-Article continues off site, courtesy The New York Times.