A horrifying crime scene in South Miami hit Facebook Thursday when a man posted a photo of his dead wife -- and a confession that he had killed her. Im 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" my wife was punching me and I am not going to stand anymore with the abuse so I did what I did I hope u understand me " Derek Medina posted the photo some time around noon Thursday, with the words "Rip Jennifer Alfonso." According to an arrest affidavit by Miami-Dade Police, Medina told investigators he and Alfonso had a verbal dispute around 10:00 a.m., during which he grabbed a gun from a closet and pointed it at his wife. There, Medina told police, Alfonso began punching him. He retrieved the gun from upstairs and again confronted his wife, prompting her to pick up a knife. Miami New Times reports Medina has authored a number of self-help e-books, including one titled "How I Saved Someone's Life and Marriage and Family Problems Thru Communication." Medina's father told WSVN that the couple had a troubled relationship, and had remarried last year after previously getting a divorce. Incredibly, Medina's grisly posts remained published on Facebook until just before 5 p.m. Thursday, when they appeared to have been removed. "We took action on the profile -- removing the content and disabling the profile, and we reached out to law enforcement.