Just too close a match for the stereotypical "pro-life extremist" description to be entirely believable.
George Tiller thought his political connections to the White House would protect him. He learned far too late that Obama throws those closest to him under the bus first. The pro-abortion movement needed a fresh martyr, and George Tiller fit the bill.
It is very possible this is Obamacide, but it will be tied to a “right-wing extremist” to cover the tracks.