A suspect previously featured in The Dallas Express’ “Dirty John” crime blotter series has been hit with new sex crime charges, according to updated jail records from Collin County.
Collin County Sheriff’s Office records show that Marty Duwayne Griego, 52, now faces three felony charges, including one count of Continuous Sexual Abuse of a Disabled Individual, along with two additional charges out of Nueces County: Indecency with a Child Sexual Contact and Aggravated Sexual Assault. His combined bond has been set at $425,000, according to the county jail listing.
Marty Duwayne Griego
Griego was originally booked into the Collin County jail on June 25, 2025, on the single charge of Continuous Sexual Abuse of a Disabled Individual with a bond of $200,000. Updated jail information now shows that two additional warrants were lodged against him from Nueces County, carrying bonds of $100,000 and $125,000, respectively.
Collin County Sheriff’s Office Public Affairs Officer Sergeant Jessica Pond told The Dallas Express that the discovery of the Nueces County charges occurred during a routine process where the county searches for other outstanding charges against inmates in its custody. Pond said the jail records were updated after it became apparent that Marty was also facing charges in Nueces County.
According to the updated booking sheet, Griego remains in Collin County custody. The charges from Nueces County are tied to separate cases involving alleged sexual contact and assault, but details surrounding those allegations were not immediately available.
Griego, a Plano resident, is described in jail records as a white male, 5 feet 7 inches tall, weighing 160 pounds, with black hair and green eyes. He is presumed innocent unless and until proven guilty in court.
Griego was previously featured in the June edition of Dirty John, which ranked him among Collin County’s most serious sex-crime suspects at the time based on total bond amount. That earlier list included five defendants accused of various sexual offenses, including assaults on minors and disabled individuals.
The updated jail listing now lists Griego’s total bond as more than double the original figure, reflecting the new charges lodged against him outside Collin County.
As of October 24, court proceedings in both Collin and Nueces Counties remain pending.
DX contacted Griego’s court-appointed defense counsel for comment, but did not respond by the time of publication.