A woman was shot to death Friday near Liberty Park, police said.   A man walked into the Glenwood Autism and Behavioral Health Center off Sicard Hollow Rd. at approximately 2 PM, and fired several shots at his wife, killing her, according to investigators.  The man then left the scene in a waiting car.    He was arrested by Irondale police a short time later.     Neither the victim, nor the suspect, were immediately identified.