Man pleads guilty to 2023 murder of ex-girlfriend in Midland

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A man has pleaded guilty to the 2023 killing of his ex-girlfriend, Madeline Pantoja, whose remains were found in a remote area of Midland County, Texas. Mario Juan Chacon Jr. entered his plea in the 142nd District Court and was sentenced to 35 years in prison for the murder as well as 20 years for tampering with evidence.

Why it matters

This case highlights the ongoing issue of domestic violence and the tragic consequences when relationships turn violent. It also underscores the importance of thorough police investigations and the role of the justice system in holding perpetrators accountable for their crimes.

The details

According to the arrest affidavit, officers found evidence of a struggle in Pantoja and Chacon's shared apartment, including a mop with dirty water, a missing bed comforter, and a dark red stain on the bed sheet. Pantoja's remains were later discovered in a remote area of Midland County. Chacon was arrested on May 20, 2023 and charged with first-degree murder. He was later re-indicted on an additional charge of tampering with evidence.

• On May 11, 2023, Midland Police Department officers were dispatched to Pantoja and Chacon's apartment after her brother reported not hearing from her.
• On May 12, 2023, officers responded to a second call for a welfare check at the apartment.
• On May 20, 2023, Chacon was arrested and charged with Pantoja's murder.
• On July 19, 2023, Chacon was indicted on a charge of murder.
• On November 19, 2025, Chacon was re-indicted on a second charge of tampering with evidence.

What’s next

The judge in the case will decide on Tuesday whether or not to allow Chacon out on parole after he serves half of his 35-year sentence.