A former Monument Academy teacher charged with first-degree murder after fatally stabbing one person and injuring two others told police it was in self-defense, court documents obtained by The Gazette show.

Matthew Regnier, 33, claimed the three people who lived with him carried out a “three on one” assault, and each person had intentions to harm several specified areas of his body for a reason he was unsure of.

After hearing this, the Colorado Springs police detective interviewing Regnier told him the video he took and physical evidence at the scene do not support his claim, according to court documents.

Two 911 calls came from the 1400 block of North El Paso Street on Friday with one from a victim reporting a domestic disturbance and the other from Regnier about 8 minutes later, claiming he had been attacked.

Police arrived minutes after midnight to find three people stabbed and Regnier bloodied, holding a child, court documents stated.

Regnier is charged with first-degree murder, two counts of criminal attempt of murder, three counts of first-degree assault and child abuse. He appeared in custody in court on Monday to waive an advisement hearing and will have his formal first appearance on Nov. 10.