Update in the suspected murder-suicide down in Florida ... officials say Ryan Whiten slaughtered his ex-wife and their daughters before killing himself. As we reported ... Ryan, his ex-wife, Melanie Hyer , and their daughters  Savannah  and  Sienna , were found dead with stab wounds in their Doral home Tuesday after deputies from the Miami-Dade Sheriff's Office responded to a welfare check. MDSO suspected a murder-suicide but didn't know who did the stabbing ... and now they've determined it