Locked up: Martin Alvarado Jr, 23, allegedly repeatedly hit his girlfriend's young son last week . A 23-year-old man beat his girlfriend's 18-month-old son to death for urinating him as he changed the boy's diaper, according to police. Martin Alvarado Jr., from Cicero, Illinois, appeared in court on Monday on a first-degree murder charge for the death of Edwin Eli O'Reilly and has been ordered to be held without bail. He was watching Edwin at their home in Cicero last Thursday when the toddler urinated on him during a diaper change, according to authorities. Enraged, Alvarado allegedly repeatedly hit the little boy. Police and paramedics responded to the home following a call about an unresponsive child and Edwin was rushed to MacNeal Hospital in Berywn, where he later died. According to the Cook County Medical Examiner, the child suffered from multiple blunt force trauma and his death was ruled a homicide. During questioning, Alvarado allegedly confessed to the assault on videotape, the Chicago Tribune reported. An Illinois Department of Children and Family Services spokeswoman said the agency had prior contact with the family, but would not provide further details. Scene: He was looking after the boy at his home on this Cicero, Illinois block when he allegedly became enraged that the boy urinated on him during a diaper change. He allegedly admitted to the attack . Another, older child at the home was taken in by the Department of Children and Family Services. The girlfriend was not home at the time of the alleged attack. Alvarado was scheduled to appear for a bond hearing on Monday morning but it was delayed after he allegedly trashed his cell overnight, authorities told the New York Daily News. When he did appear in court, he was ordered to be held without bail by the judge. He is due back in court on April 28.
Martin Alvarado, Jr., 'was looking after Edwin O'Reilly on Thursday and became enraged when the child urinated on him as he changed his diaper'
He 'confessed to police that he repeatedly struck the boy, killing him'
Alvarado is being held without bail on a first-degree murder charge .