DA Greg Willis Announces 75-Year Sentence for Frisco Man Who Stabbed Lyft Driver While Planning to Kidnap Child

October 13, 2026

(McKinney, Texas) – Collin County District Attorney Greg Willis announced today that Antwain Karmen Williams, 20, of Frisco, was sentenced to 75 years in Prison for Aggravated Robbery.

The Crime

On December 16, 2024, Frisco Police responded to a 911 call of a vehicle taken at knifepoint. Officers found the victim suffering from multiple knife wounds, including a slit throat and a severely cut hand. Before emergency surgery, the victim told police he was a Lyft driver and the attacker was his passenger. The victim survived.

The Investigation

Within hours, Frisco Detective Justin Freeman obtained information from Lyft identifying the last rider. Although a fake name was used, the email and phone number linked to Antwain Karmen Williams. Records showed Williams had an outstanding arrest warrant for Sexual Performance of a Child involving a 13-year-old victim. Snapchat messages recovered from Williams showed he planned to steal the car that night in order to kidnap the same 13-year-old.

Law enforcement tracked Williams, who fled in the stolen vehicle, crashed into another car, and was taken into custody by Texas DPS Trooper Justin Diaz. In a post-arrest interview, Williams first blamed a fictional person named “Landon,” then claimed the Lyft driver had locked him in the car and that he attacked only to escape. Additional evidence included a Snapchat photo of Williams smirking while holding the stolen keys with the caption “we mobile baby,” and earlier messages stating “I’m boutta get a car.”

The Trial and Sentence

Williams pled guilty to the first-degree felony of Aggravated Robbery. Jurors heard evidence of the robbery, the pending Sexual Performance of a Child case involving the 13-year-old, and other bad acts. Detective Walker Martin testified about phone evidence showing the illegal nature of Williams’ relationship with the child victim. Jurors also heard that Williams had spoken sexually with a 14-year-old, recorded and posted videos of sexual encounters with two prior girlfriends who were 16 and 17 at the time without their permission, and threatened to “jump” another person upon release.

The jury sentenced Williams to 75 years in prison. Judge Jim Pruitt presided.

Statement from District Attorney Greg Willis

“This man attacked a hardworking Lyft driver at knifepoint, nearly killing him with a slit throat and severe wounds, as part of a plan to kidnap a 13-year-old child. A Collin County jury heard the full evidence and delivered a 75-year sentence. Our community won’t tolerate this kind of violence.”

Prosecution Team

Assistant Criminal District Attorneys Alex Haynes and Anthony D’Amore prosecuted the case, assisted by District Attorney Investigator Greg Bowers.

Report suspected child sexual exploitation: Submit tips anonymously to www.cybertip.org or contact your local police department.

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