Sentencing Jury Considers Death Penalty for Alberto Sierra
A 12-person jury will decide between life in prison and the death penalty for the 2012 killings.
Updated on Oct. 6, 2026 in Violence
A jury is now tasked with deciding the fate of Alberto Sierra after he pleaded guilty to the 2012 suffocation deaths of 29-year-old Gladys Machado and two young children in Flagami. Prosecutors concluded their case on Tuesday following emotional testimony from family members.
Why it matters
The proceedings mark the final phase of a long-standing capital case regarding the 2012 tragedy that left three victims dead. The jury must now weigh the evidence presented during the sentencing trial to determine if the defendant will face life in prison or death.
The jury of 12 is weighing sentencing options for 42-year-old Alberto Sierra after hearing testimony regarding the 2012 deaths of Gladys Machado, 29, and two children, ages 6 and 3. The final decision remains pending as the trial concludes.
The players
Alberto Sierra
The 42-year-old defendant who pleaded guilty to the murders.
Marisa Tinkler Mendez
The judge presiding over the sentencing trial.
The details
Alberto Sierra admitted to suffocating Gladys Machado, 6-year-old Julia, and 3-year-old Daniela using a plastic bag in their Flagami home. Their bodies were discovered inside a closet three days after the incident. Judge Marisa Tinkler Mendez is presiding over the trial in Miami-Dade as the jury deliberates on the appropriate punishment.
Timeline
Nov. 10, 2012: The killings occurred in Flagami.
Nov. 13, 2012: The victims' bodies were discovered.
Tuesday: Victim-impact statements were delivered in court.
Beyond the 305
This sentencing process follows the established Florida Supreme Court death penalty sentencing guidelines for capital offenses. It represents the final legal stage in a case that adheres to the state's rigorous requirements for juror consensus in capital punishment decisions.
Residents following this trial should watch for the jury's final verdict to conclude this long-standing local case. The decision serves as a closing chapter for the legal process involving the 2012 tragedy in the Flagami neighborhood.
The takeaway
The jury's decision will determine the permanent legal outcome for the defendant. Continue to monitor court filings for the final sentencing verdict.
Further reading
For more on judicial proceedings, visit our Violence coverage.
