May 5, 2026
(McKinney, Texas) – Collin County District Attorney Greg Willis announced today that Marty Duwayne Griego, 52, of Denton, Texas, was sentenced to 50 years in prison without parole for Continuous Sexual Abuse of a Disabled Individual after sexually abusing a severely autistic child.
The Crime
Griego had an ongoing relationship with the child’s family that gave him access to the victim. Over the course of a year, he repeatedly sexually abused the severely autistic child, with the abuse ending when she was 15 years old. The crimes came to light when Griego assaulted the victim in front of another child, who immediately outcried to authorities. Plano Police Department was notified.
The Investigation
The victim underwent a medical exam that produced DNA evidence linking Griego to the abuse. She was then forensically interviewed at the Children’s Advocacy Center of Collin County, where she provided detailed accounts of repeated abuse occurring in Plano, Carrollton, and Corpus Christi. Plano Police Detective Catherine Foreman led the investigation.
The Verdict and Sentence
On April 22, 2026, a Collin County jury convicted Griego of Continuous Sexual Abuse of a Disabled Individual. During the punishment phase, jurors heard evidence that Griego had also sexually abused another child and had sexually assaulted an adult who reported the crime after his arrest. The jury assessed punishment at 50 years in prison. By law, the sentence carries no eligibility for parole. Judge Rayburn Nall presided over the trial.
Statement from DA Greg Willis
“A serial predator who preyed on a severely disabled child will never walk free again. This 50-year, no-parole sentence delivers the justice our most vulnerable victims deserve.”
Prosecution Team
Assistant Criminal District Attorneys Jean-Marie Anderson and Wendy Correa prosecuted the case, assisted by District Attorney Investigator Greg Bowers and Victim Assistance Coordinator Melissa White.
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