Miami-Dade man pleads guilty to 2012 murders of wife and her 2 daughters

A Miami-Dade man has pleaded guilty to the horrific murders of his wife and her two young daughters nearly 14 years ago and will now face a possible death sentence. Alberto Sierra, 42, pleaded guilty on Friday to three counts of first-degree murder, three counts of kidnapping, two counts of abusing a human body and one count of armed burglary. The charges stem from the killing of Gladys Machado and her 4- and 6-year-old daughters, who were found slain in a northwest Miami-Dade home on Nov....