He was fatally shot shortly after 10 a.m. Sunday at Reformation Lutheran Church, Wichita police said.

Sunday afternoon, authorities took a man into custody near Kansas City after stopping a car that matched a description of the killer’s getaway vehicle, according to sheriff’s deputies in Johnson County, Kansas. No charges had been filed.

Wichita police said they were searching for a powder-blue Ford Taurus in connection with the killing. Witnesses provided a license number of the car the killer used to speed away from the church, police spokesman Gordon Bassham said.

Tiller “dedicated his life to providing women with high-quality heath care despite frequent threats and violence,” his family said in a written statement.

“We ask that he be remembered as a good husband, father and grandfather and a dedicated servant on behalf of the rights of women everywhere,” the family said.

Abortion is one of the hottest buttons in U.S. politics, with opponents arguing the practice is tantamount to the murder of an unborn child. Abortion rights supporters argue the decision to terminate a pregnancy is best left to the woman.

The anti-abortion group Operation Rescue, which has led numerous demonstrations at Tiller’s clinic, condemned the shooting as a “cowardly act.”

“Operation Rescue has worked for years through peaceful, legal means, and through the proper channels to see him brought to justice,” the group said in a statement. It offered its prayers for Tiller’s family, “that they will find comfort and healing that can only be found in Jesus Christ.”

In March, Tiller was acquitted of 19 counts of performing procedures unlawfully at his clinic. In 2008, a probe initiated by abortion opponents who petitioned state authorities to convene a grand jury ended without charges.

On its Web site, Operation Rescue refers to Tiller as a “monster” who has “been able to get away with murder.” And Operation Rescue founder Randall Terry, who is no longer affiliated with the group, called Tiller “a mass murderer.”

“We grieve for him that he did not have time to properly prepare his soul to face God,” Terry said in a written statement. “I am more concerned that the Obama administration will use Tiller’s killing to intimidate pro-lifers into surrendering our most effective rhetoric and actions. Abortion is still murder, and we still must call abortion by its proper name.”

The 1993 attack on Tiller left him wounded through both arms. An ardent foe of abortion, Shelley Shannon, was convicted of attempted murder and is serving a 20-year sentence in federal prison for the shooting.

If Tiller was slain because of his work, he would be the fourth U.S. physician killed by abortion opponents since 1993. In addition, a nurse at a Birmingham, Alabama, clinic was maimed and an off-duty police officer was killed in a 1998 bombing by Eric Rudolph, who included abortion among his list of anti-government grievances.

Rudolph admitted to that attack and three other bombings — including the 1996 attack on the Olympic games in Atlanta, Georgia — and is serving life in prison.

There are those who believe in the Rapture prophesied in the Bible. And there is Joshua Witter, avowed atheist.

They need each other.

At least some people think so — those willing to pay Witter to be their post-apocalyptic postman, delivering cards and letters to their non-believing friends, relatives and neighbors who will be left behind when the Day of Reckoning arrives.

About 70 people have paid the Orlando man about $5 apiece to get their messages to those doomed to face the plagues, pestilence and darkness of Armageddon

As sure as the True Believers are they will escape this earth when the Rapture arrives, Witter is just as certain he will be left behind to deliver their mail. He has committed blasphemy to make sure.

“Anyway you look at it, I’m screwed. It’s too late for me,” said Witter, a 24-year-old computer software engineer who wears long sideburns and hip black-framed glasses.

Witter started his website — postrapturepost.com — as a joke, a satiric jab at those who see things like the swine flu, economic collapse and the election of a liberal president as sure signs the end is near.

But then he started receiving orders for his merchandise. Since 2005, Witter said he has sold more than 200 items, most of them T-shirts and coffee mugs, and many of those (he admits) to friends and fellow atheists.

Among the best sellers are the line of I-Told-You-So cards, which sell for $8. Some of those who ordered the cards — Witter suspects they are not true Christians — are willing to pay extra to have them sent early as Christmas cards.

Witter doesn’t have a stack of cards or letters with Post-Rapture messages in a dresser drawer or safety deposit box. All the messages are stored in his computers, encrypted to protect their privacy and backed up by a fail-safe system. His website might be all in jest, but when it comes to his paying customers, Witter is a responsible entrepreneur. He doesn’t share the contents of the messages with his friends over beers or mock those who take this whole end-of-the-world business more seriously than he does.

He concedes that delivering on his promise to hand-deliver the cards and letters entrusted to him may be difficult. Witter has read all the books of the popular “Left Behind” series, so he knows what to expect. Covered with boils, he will have to fight his way through perpetual darkness, clouds of insects, and meteors falling from the sky to deliver the mail.

“Your hope lies with me. I am your mailman,” he vows. “I’ll do my best come Hell or high water to deliver those letters.”

On the other hand, should the Rapture not arrive in his lifetime, he gets to keep the money, which he promises to use to subsidize his sinful lifestyle.

And don’t even think about asking him to forward a message from the future for free.

“I turn people away who ask for free letters,” he said. “I’m not a charity.”