A jury in Wichita, Kan., has found Scott Roeder guilty of first-degree murder in the shooting death last spring of a doctor who performed late-term abortions.
The jury deliberated for only 37 minutes Friday before returning the verdict.
Roeder, an airport shuttle driver, had testified he killed Dr. George Tiller on May 31, 2009 to protect unborn children.
Roeder faces a mandatory sentence of life in prison. He will have the possibility of parole after 25 years. He is to be sentenced March 9.
Prosecutor Nola Foulston plans to ask for a so-called "Hard 50" sentence, which would require Roeder to serve at least 50 years before being eligible for parole.
Roeder, 51, testified he shot Tiller in the head in the foyer of Reformation Lutheran Church.
Roeder also was convicted on two counts of aggravated assault for threatening to shoot church ushers Keith Martin and Gary Hoepner as he fled after shooting Tiller.
Roeder's lawyers had been hoping for a reduced charge of voluntary manslaughter. However, the judge said the jury could not consider such a verdict.
Tiller's family, including his widow, Jeanne, issued a statement in which they wanted him to be "remembered for his legacy of service to women, the help he provided for those who needed it and the love and happiness he provided us as a husband, father and grandfather."
With files from The Associated Press