(Miami, FL)  --  The South Miami man who allegedly killed his wife and posted a picture of her bleeding body on Facebook is pleading not guilty to the charge.  Derek Medina went to police and confessed to killing Jennifer Alfonso in the kitchen of their home.  Medina also posted on the social media website that he was the victim of Alfonso's abuse and wrote that he wasn't going to take it anymore. He remains jailed on charges of first-degree murder.