The father of a 5-month-old boy who died in August is accused of putting his son in an unsafe sleeping situation to punish the infant and muffle his cries, according to a grand jury indictment.

A separate indictment for the infant's mother says she was complicit in the death of Nicholas Lucero Junior.

Nicholas Manuel Lucero, 21, and Elizabeth Elishah Lopez, 20, were arrested Thursday on suspicion of child abuse resulting in death after a grand jury indictment was filed Wednesday, court records show.

According to Colorado Springs police, the infant died Aug. 19 after he was placed in a closet shelving unit to sleep with pillows in front of the shelf to muffle the sound of the baby's crying.

The indictments also indicate that the baby was left in the care of a minor, but do not elaborate.

The cause and manner of death have not been released by the El Paso County Coroner's Office.

Both parents remained in custody Monday at the El Paso County jail in lieu of $50,000 bonds, and are scheduled for first appearances in court on Thursday, records show.