How does Catholic Church deal with priests who have since turned atheists? The other day, media brought up the news of Rev. Vosper who does not believe in God, but has been allowed to administer in the United Protestant Church of Canada. A Canadian Preacher Who Doesn’t Believe in God.

I am eager to know how the Catolic Church deals with priests who have since turned atheists . Is there an official procedure for the same ?
If the priest who apostatized and became atheist is obstinate in his heresy, he is to be deposed/defrocked:
1917 can. 2314:

§1. All apostates from the Christian faith and all heretics and schismatics:
1°. Incur excommunication ipso facto, and
2°. Unless they repent, shall be deprived of any benefice, dignity, pension or other charge which they may hold in the Church, and be declared infamous; clerics, after repeated warning, shall be deposed;