A Collin County jury has sentenced a Denton man to 50 years in prison without the possibility of parole after convicting him of continuous sexual abuse of a severely autistic child.
Marty Duwayne Griego, 52, was found guilty on April 22, 2026, for abusing the child over the course of a year, ending when the victim was just 15 years old. Prosecutors say Griego used a trusted relationship with the victim’s family to gain access—turning familiarity into a weapon.
The abuse came to light after another child witnessed an assault and reported it, prompting an investigation by Plano police. Authorities built their case using DNA evidence, forensic interviews, and the victim’s detailed accounts of repeated abuse across multiple cities, including Plano, Carrollton, and Corpus Christi…