A Grimes, Iowa, father will spend decades behind bars after pleading guilty in the death of his infant daughter and an assault on her mother. On October 9, 2026, Polk County District Judge Coleman McAllister sentenced Dylan James Brown, 24, also known as Guy Green, to a total of 58 years in prison.
Social media posts calling it a straight “50-year” sentence miss key details. Brown received 50 years for child endangerment resulting in death, five consecutive years for domestic abuse assault, and three more years for a probation violation tied to a 2023 road-rage case. He must serve at least 35 years before parole eligibility and pay $150,000 in restitution to the child’s family. The Polk County Attorney’s Office described the outcome as a 58-year prison term.
Emergency personnel came out to Brown’s residence located on the 600 block of NE Jacob Street on August 7, 2025 due to an incident where a two month old baby had stopped breathing. It was found that Brown had hit Mia Green over 40 times. The baby girl had multiple fractures in her skull, ribs, clavicle, tibia and pubic bone as well as brain hemorrhage. It was determined by medical experts that the injuries did not result from any kind of resuscitation.
The mother of the baby tried to stop Brown. He choked her till she passed out but she survived. Mia was kept on life support but passed away on August 19, 2025.
Brown was arrested on the same day. Murder charges that were originally filed against him were changed to first degree murder after the autopsy was conducted. On August 2026, he pled guilty to child endangerment causing death and domestic abuse assault restricting air/blood circulation. Murder charges were dropped according to plea deal.
At sentencing, Judge McAllister noted Brown’s size six-foot-two and 350 pounds against the infant.
“Mr. Brown was six-foot-two, 350 pounds, and he beat his child to death,”
The judge said.
“These crimes are not only senseless, they shock the conscience.”
Assistant County Attorney Shannon Bogolin told the court the case was “about the childhood he took.” Defense attorneys cited Brown’s mental health history and abusive childhood, and Brown himself told the judge he believed at the time that striking the baby would somehow save her. The court rejected a lower mandatory minimum.
