There is another character named Calvin you might be looking for.
Role: Prior to Episode 4 - Mannequins
Calvin is known for killing a family in episode 4. He was the daughters date to a dance, but he had other plans. He tied the family up, he first opened the mothers blouse, and stabbed her. He showed the father the hole in her heart, as said in the show. He took out one of her lungs. He then cut one of the child's head open.