A former minister and fervent pro-lifer is the suspect in the shotgun murder of a Pensacola, Fla. abortion-clinic doctor and his volunteer security escort. Dr. John Bayard Britton, 69, was wearing a bullet-proof vest, but the gunman shot him in the head. The wife of the slain escort was injured. Paul Hill, who has in the past advocated violence as a biblically sanctioned means to stop abortion, has been arrested. Another Pensacola abortion-clinic physician was murdered in March, 1993. Spokespeople for and against abortion rights condemned today's slaying.