MIAMI (CBS4) – An indictment has been filed in the case against a man accused of murdering his wife and her two daughters last month, according to the Miami-Dade Clerk of Courts website.

Alberto Sierra, 28, is charged with three counts of first-degree murder, a capital offense.

Miami-Dade Police investigators said Sierra confessed to killing Gladys Machado and her two young daughters.

“At that time he used a plastic bag to asphyxiate Gladys and after that he sexually assaulted her,” Det. Rosanna Cordero-Stutz said shortly after Sierra’s arrest.

The sexual battery charges against Sierra were no longer showing up on the Miami-Dade Clerk of Courts website as of Wednesday night.

Instead, the final two charges read “human body-dead-abuse”, indicating desecration of remains.

Police allege the rapes of two of the victims happened after the murders.

Documents obtained by CBS4 News show that DNA collected from the body of one of the daughters was analyzed and matched Alberto Sierra. Documents also show the DNA came from nail scrapings, arm swabs, underwear, and the pants of one of the girls.

Sierra is also charged with kidnapping and armed burglary.

The grand jury indictment allows prosecutors to pursue the death penalty against Sierra.

Sierra has been assigned a public defender.

According to the Miami-Dade Clerk of Courts website, Sierra filed a written plea of not guilty on November 29^th.

His formal arraignment is set for January 10^th.