Operation Rescue (now known as Operation Save America) states,

"George Tiller was a mass-murderer. He had blood all over his hands. Now we grieve for him that he was shot in this deplorable manner and he did not have a chance to get things right with his maker perhaps. Every man deserves to have a trial of a jury of his peers and then a proper execution, not to have somebody become judge, jury and executioner on their own."