A husband confessed today to suffocating his wife and two stepdaughters, authorities said.
Alberto Sierra, 28, also admitted that he had raped eight-year-old Julia Padrino and her mother Gladys Sierra, 29. He then murdered them along with the youngest girl Daniela Padrino, four, at their Miami home.
Sierra had gotten into a fight with his estranged wife on November 10 while they were driving to a Florida mall with the two girls.
Alberto Sierra pulled out a knife and 'harmed' Mrs Sierra, according to a police report.
Miami-Dade Police did not describe her injuries from the argument.
Sierra then took the woman and her daughters back to the house in a Miami suburb, where he locked the girls in a bedroom and forced Gladys into the master bedroom.
He then suffocated her with a plastic bag and sexually assaulted her.
Sierra later suffocated the young sisters with a plastic bag and sexually assaulted the eldest.
Police said one of the girls was sleeping when she was suffocated.
The girls are not the defendant's biological children. Police say Mrs Sierra's six-year-old son was safe with his grandmother.
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