Poppy's By the Tree (1) - S2-E1
Factual error: At the end of the episode, the killer shoves a long machete up through the mattress. This isn't possible considering he's under a bed and there's not enough vertical space to shove a machete straight up.
Answer: It's implied that Steve filed for divorce since in s04e16, "You Gotta Know When to Hold 'Em", Marcy says that Steve is suing for alimony. Alimony is something that has to be requested when filing for divorce. Although the show doesn't spend time on the actual legal proceedings of their divorce.
Bishop73