Anthony Parker is the director of the Altwood Sober House, which exchanges patients with the Lux Residential Treatment Center run by Dr. Dennis Barkley. Parker is revealed to be raping the girls who come in and out of the sober house in exchange for drugs. He's partnered with Barkley to send them back to Lux once the girls are dependent again, where Barkley bilks the families and insurance companies with overpricing. Parker got a girl named Natalie Curtis pregnant, so he killed her with a drug overdose.
Parker was arrested and imprisoned for his crimes. Barkley was killed by one the horrified social workers at the clinic, Rosemary Taylor. (SVU: "Unintended Consequences")