[video=youtube;RCFQGkiTKOY]https://www.youtube.com/watch?v=RCFQGkiTKOY[/video] A Florida man purportedly confessed on Facebook to killing his wife and posted a chilling, graphic photo her of bloodied body before turning himself into authorities on Thursday. Derek Medina, of South Miami, posted the grisly photograph of his 26-year-old wifeâ€™s body on the floor, claiming Jennifer Alfonso had punched him and he was wasnâ€™t going to tolerate the abuse any longer. â€œIm going to prison or death sentence for killing my wife love you guys, miss you guys takecare Facebook people you will see me in the news,â€ the now-deleted Facebook page read. Medina, a 31-year-old property management supervisor who has written e-books on subjects like saving marriage through communication, said the couple became involved in a heated argument in a bedroom when he armed himself with a gun and pointed it at Alfonso, according to an affidavit. The 6-foot, 200-pound Medina said Alfonso then left the bedroom, returning later to say she intended to leave Medina, who responded by confronting her in the kitchen. At that point Alfonso began punching Medina, he said, prompting him to return upstairs to retrieve his gun to confront her again. After Alfonso grabbed a knife, Medina said he was able to disarm her and put the knife in a drawer, at which point Alfonso began punching him again. Medina then shot her several times, according to affidavit. Alfonsoâ€™s 10-year-old daughter, who was upstairs at the time of the killing, was unharmed.