The accusations against Agüero stem from forensic exams showing the babies received lethal doses of potassium, which is fatal, especially for hours-old infants.
The attacker entered the home under the guise that he was going to be doing repairs in her home.
Victim was stabbed 14 times while protecting her 5-year-old daughter; suspect's accomplice remains at large.
"We had an obligation to act quickly and arrest the suspect in this heinous murder."
Prosecutors have indicted Guatemalan citizen Sebastian Zapeta-Calil, 33, for the alleged murder of an unknown woman on December 22, according to NBC News.
If convicted, he faces a maximum sentence of life in prison without the possibility of parole.
Mangione, 26, would face a mandatory sentence of life in prison without the possibility of parole if convicted on all counts.
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