The punishment followed a seven-year case marked by competency delays, an insanity defense and testimony from the defendant’s son.

MANSFIELD, Texas — A Texas woman has been sentenced to two life terms, including one without the possibility of parole, after a Tarrant County jury convicted her of capital murder and injury to a child in the 2019 suffocation death of her 9-year-old niece, Melodi Sneed. Mercia Sneed, 47, was convicted in August after prosecutors presented evidence that she killed the child inside her brother’s newly purchased Mansfield home during a family gathering to unpack and celebrate the move.

The verdict and sentences brought a courtroom resolution to a case that had remained pending for about seven years. Prosecutors said family members gathered at the Eagle Drive house on July 27, 2019, as Melodi’s parents settled into their new home. Sneed and her teenage son were also staying there. By the following afternoon, Melodi had been found unresponsive, taken to a hospital and pronounced dead. What initially brought Mansfield police to the house as a reported cardiac arrest developed into a homicide investigation and then a capital murder case after investigators interviewed people who had been inside the home.

The length of the case became part of the prosecution’s closing argument. Assistant District Attorney Charlie Boulware reminded jurors that Melodi’s relatives had been waiting years for the criminal case to reach a verdict. The jury found Sneed guilty of capital murder and of injury to a child causing serious bodily injury. The capital murder conviction resulted in a life sentence without parole because prosecutors had not sought the death penalty. A second life term was imposed on the injury-to-a-child count, giving the case a final punishment after years in which Sneed’s ability to proceed through the court system had repeatedly become an issue.

Evidence at trial returned jurors to the family gathering in the summer of 2019. Prosecutors said Melodi fell asleep on a couch in an upstairs game or media room after other relatives had gone to bed. Sneed was in the room with her then-13-year-old son and at least one other young child. Her son testified that his mother told him to leave for a room down the hallway. From there, he said he could see part of what happened. He described seeing his mother take a pillow and get on top of his cousin. He also heard muffled sounds while Melodi struggled, according to courtroom reporting.

The boy’s account became important almost immediately after authorities arrived. When police and emergency personnel were first called to the house, officers were still confronting what could have appeared to be a medical emergency. Melodi was taken to Mansfield Methodist Hospital, where she was pronounced dead. Sneed’s son then told an officer what he had observed in the game room. Investigators questioned him further and interviewed Sneed. An arrest affidavit released shortly after the death said Sneed eventually acknowledged holding a pillow over Melodi’s face for several minutes while lying on top of her. Investigators also sought Sneed’s DNA as they worked to corroborate statements with physical evidence.

Authorities initially arrested Sneed on a charge of injury to a child causing serious bodily injury. Mansfield police upgraded the case to capital murder after additional interviews and evidence were gathered. Contemporary police reports said the Tarrant County Medical Examiner’s Office classified Melodi’s death as a homicide. Investigators also learned that a pillow connected to the killing had been moved from the room and that a bottle of peroxide had been discarded outside the house. Prosecutors later pointed to Sneed’s conduct after Melodi stopped moving as evidence that she understood what she had done and knew it was wrong.

That question became central at trial because Sneed’s lawyers did not simply dispute that she caused Melodi’s death. They argued that severe mental illness meant she was legally insane when the killing occurred. A psychologist retained by the state diagnosed Sneed with schizoaffective disorder, according to courtroom reporting, and testimony described a history of delusional beliefs. The record also showed that Sneed had spent significant periods in a state hospital after psychologists found her incompetent to proceed. Competency problems contributed to the unusually long span between the 2019 killing and the 2026 trial.

The defense maintained that Sneed’s mental condition prevented her from understanding the wrongfulness of her conduct. Prosecutors took the opposite position. They highlighted actions after the killing, including moving items and trying to clean Melodi’s face, and argued those steps showed awareness that the conduct was criminal. The jury ultimately rejected the insanity defense and returned guilty verdicts. The result did not erase the evidence of Sneed’s serious psychiatric disorder; rather, it meant jurors were not persuaded that her mental condition met the legal standard necessary to excuse criminal responsibility for the offenses charged.

Testimony from Sneed’s son also gave jurors a rare account from someone who had been only a few steps away. He testified as an adult about events he witnessed when he was 13. Courtroom reporting said he acknowledged that his view from the hallway was incomplete and that he understood what was happening from his mother’s position, Melodi’s movements and the sounds he heard. Prosecutors paired his account with Sneed’s later statements to investigators and evidence about what happened after the child became unresponsive. That combination allowed the state to reconstruct the night even though most relatives in the house had already gone to sleep.

The case had begun under far less certain circumstances. Officers responding shortly after midday on July 27, 2019, joined efforts to revive Melodi after a cardiac arrest call from the house. Early public statements did not disclose how she died. Police said only that a death investigation was underway and that Sneed had first been arrested for injury to a child. Within days, however, investigators said additional information had led them to seek the more serious capital murder charge. The arrest affidavit later disclosed Sneed’s statement and her son’s account, providing the first detailed public explanation of why authorities had reclassified the death as a homicide case.

Public reporting from the trial has not established a clear motive for why Sneed killed her niece. Evidence about Sneed’s delusions and mental illness became relevant to the insanity defense, but prosecutors did not have to establish a conventional motive to prove the charged conduct. The trial instead focused heavily on what Sneed did, what her son observed, what she told investigators and whether she understood that her actions were wrong. That distinction left the jury to resolve criminal responsibility while leaving a broader question about why the attack occurred without a simple answer in the public record.

With the verdict and sentencing complete, Sneed faces life in prison without parole on the capital murder conviction along with the additional life term for injury to a child. The result closes the trial stage of a prosecution that began when Mansfield officers arrived at a new family home in 2019 expecting to investigate a child’s medical emergency and ended seven years later with two felony convictions. Prosecutors framed the proceeding around Melodi and the years her family had waited for the case to reach a jury.

Author note: Last updated September 28, 2026.