A 27-year-old Washington, D.C. man has pleaded guilty to beating his girlfriend's two-year-old son to death in 2022, admitting to a chain of violence that started at a Dunkin' Donuts and ended with the boy unconscious and bloody inside a parking garage. Dasean Matthews entered the plea nearly four years after toddler Mars Jones died, closing out a case that had dragged through multiple delayed trial dates and a rejected plea deal.
According to DC News Now, Matthews and his romantic partner, Monet Jones, took her son to a Dunkin' Donuts around noon on October 13, 2022, according to court documents cited by the outlet. The U.S. Attorney's Office for the District of Columbia disclosed on Thursday that surveillance video captured three separate assaults that day, beginning at the Dunkin' Donuts on Quincy Street NW, continuing in a parking garage, and culminating in a beating inside a vehicle so violent that the car shook, according to the U.S. Attorney's Office for the District of Columbia.
Court documents described Matthews striking the toddler in the upper body and face, punching him, grabbing him by the collar of his shirt, and swinging him around, per the same account. Mars Jones reportedly fell and hit a metal railing during the assault, and prosecutors say Matthews repeatedly struck the boy again while the two were alone in a car. Matthews then delivered the unconscious and bloody child to his mother before running away, prosecutors said.
A Child's Final Days at Children's National
DC Fire and EMS took Mars Jones to the hospital, where medical records from Children's National Medical Center showed the two-year-old was admitted to the pediatric intensive care unit with an intracranial hemorrhage, diffuse brain swelling, neck abrasions, and extensive bruising across his torso, back, right ear, and limbs, according to Child Welfare Monitor DC. He died five days later, on October 18, 2022, from complications of inflicted head trauma.
Monet Jones gave conflicting accounts to police in the aftermath, the outlet reports. She initially claimed her son had been dropped off unconscious by a friend, then changed her story to say she had been carrying him to a store, all while denying knowledge of the bruises covering his back and abdomen. Police surveillance footage later contradicted her account by showing the couple arriving together at her apartment garage.
Arrest, Charges, and a Rejected Plea Deal
Members of the Capital Area Regional Fugitive Task Force arrested Matthews in Washington, D.C. on November 4, 2022, pursuant to a Superior Court warrant that initially charged him with first-degree felony murder, according to the Metropolitan Police Department. Police had originally responded to a report of an unconscious child on the unit block of Atlantic Street SW on the day of the assault.
The case moved slowly through the courts. During a June 2023 status hearing, Matthews' defense attorney argued the surveillance footage showed “rough play” rather than abuse — a claim D.C. Superior Court Judge Michael O'Keefe rejected, according to DC Witness. The judge denied Matthews pretrial release, ruling that striking a child in public and knocking him into a metal railing was entirely inconsistent with playful conduct, and found Matthews posed a danger to the community.
In October 2024, Matthews rejected a plea offer before Judge O'Keefe that would have required him to plead guilty to second-degree murder and first-degree cruelty to children, DC Witness reported. His trial was later postponed after a defense expert witness, a child neuropathologist, became unavailable. By January 2026, federal prosecutors had filed formal notice that they intended to seek a sentence of life imprisonment without release if the case went to trial.
Co-Defendant Faces Separate Felony Counts
Monet Jones, the boy's mother, was indicted separately on charges including second-degree cruelty to children, obstruction of justice, three counts of perjury, and tampering with physical evidence in connection with her son's death, according to DC Witness. She has pleaded not guilty, and the resolution of her case remains an open question. D.C.'s Child and Family Services Agency reported that the family had no recorded prior involvement with the District's child welfare system before the October 2022 incident, per Child Welfare Monitor DC, though the agency said it could disclose only limited case details because of the pending court proceedings.
Matthews has remained in custody throughout the case, according to DC News Now. U.S. Attorney Jeannine Pirro commented on the plea, saying the conviction reflects a commitment to securing justice for victims of violent crime, per the outlet's reporting.
What Comes Next
Matthews is scheduled to be sentenced on February 1, 2027. Under District of Columbia law, second-degree murder carries no statutory mandatory minimum sentence, but offenders face up to life imprisonment with the possibility of parole or early release, according to FindLaw. D.C. code distinguishes second-degree murder from first-degree murder by the absence of premeditation, meaning the sentencing judge will have wide discretion in determining how much time, if any, Matthews ultimately serves beyond nearly four years already spent in custody awaiting resolution of the case.
