MIAMI - As Alberto Sierra sat stoically in court, jurors heard his calm voice in a VHS-recorded statement taken Nov. 19, 2012, nine days after the murders and six days after the bodies of estranged wife and her two young daughters were found. Leer en español  Are you aware you are currently under arrest for the murder of Gladys, Julia, Daniela?  Miami-Dade Sheriff's Office Detective Juan Carlos Chaidez asked.

 Yes,  Sierra said.  I tied her hands behind her back.  The 42-year-old already pleaded guilty in connection with the killings. A Miami-Dade jury is deciding whether life or death is an appropriate punishment.  You tied her wrists together?  Chaidez asked.

 Yeah, with white nylon rope,  Sierra said. Sierra delivered heart-wrenching details about the horrific way he said he killed his estranged wife, Gladys Machado.  A plastic shopping bag?  Chaidez asked.  Yeah,  Sierra said.  And you place it over her face?  Chaidez asked.  Yeah,  Sierra said.  I was devastated because of what I had done, so I was crying,  Sierra said. Sierra also described killing Machado's two young daughters, 6-year-old Julia Padrino and 3-year-old Daniela Padrino. 5:30 REPORT:  She saw that her mom was dead and she started crying and screaming,  Sierra said.  I grabbed the Sedano's bag and I put it over her face.  He said,  I went to the kids' room, and Daniela was sleeping, and I sat on top of her and did the same thing.  He said he used a yellow Sedano's plastic bag to kill them.  And then, I don't know, I went crazy,  Sierra said. Sierra also described violating the bodies of Machado and Julia, delivering the account in a matter-of-fact tone that belied the brutality of the grim murders. He explained how he worked to cover it up.  Can you tell me what areas of the house you mopped?  Chaidez asked.  The master room, the closet, the bathroom, the kitchen, the living room, (inaudible) to the family room,  Sierra said. Sierra said the violence that November day started after they left the mall.  I was furious,  Sierra said.  At Mall of the Americas, what did you do there?  Chaidez asked.

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