They do.
However, if an excommunicant confesses their sin and begs for forgiveness, the excommunication will be lifted.
Pedophile Priest: The Crimes of Father Geoghan
"..Child molesters are the lowest of the low on the inmate hierarchy. But, as reported by Newsweek in a September 2003 article called ''Preying on the Predator,'' Geoghan's chief tormentors at Concord were not other prisoners but the outraged guards. Correction officers are believed to have regularly spat in his food. They called him ''Satan'' and ''Lucifer'' and insisted that the former priest – who was still a Catholic since he had been defrocked but not excommunicated – answer to those names. On one occasion, Geoghan is supposed to have discovered that a guard had defecated in his bed..."
This one was one of the worst.