MATHIS, TX – Darkness fell on a quiet neighborhood in Mathis, Texas, just days before Christmas, when police received a desperate call from a family in crisis. Now, a 22-year-old mother faces a lifetime behind prison walls after confessing to the brutal killing of her infant daughter in what authorities described as an explosion of misplaced fury.
Olivia Munoz will spend her remaining years in the custody of the Texas Department of Criminal Justice, the result of a guilty plea to charges of murder of a child under the age of 10 and injury to a child causing serious bodily harm. According to court records, two consecutive life sentences were handed down in a San Patricio County courtroom, sealing Munoz’s fate after months of investigation and legal proceedings.
The tragedy unfolded in the early morning hours of December 19, 2023, at a modest home on South Marigold Street. First responders arrived shortly after 6:30 a.m., finding 7-month-old Hazel Munoz lifeless and unresponsive. Frantic efforts by emergency crews brought the child to a nearby hospital, but their attempts to save her proved futile. The infant was pronounced dead soon after arrival, and a palpable sense of loss swept through the tight-knit community.
As details emerged, investigators began piecing together a story of shocking cruelty. Hospital staff, upon examining the baby, contacted police to report disturbing injuries that suggested far more than a tragic accident. Olivia Munoz quickly attracted the attention of law enforcement. During questioning, she admitted to repeatedly injuring Hazel in separate incidents, actions she never attempted to conceal or seek medical care for.
The initial investigation revealed that, at the time, Munoz was pregnant and also caring for an older daughter, just over a year old, who appeared unscathed. Authorities soon arrested Munoz, charging her with two counts of injury to a child. But the case would grow darker in the days that followed.
Hazel’s autopsy uncovered a devastating catalog of injuries—multiple fractures to her tiny arms, ribs, and skull—markings of sustained abuse that ultimately ended in homicide. In January, after reviewing the autopsy, police upgraded the allegations against Munoz to murder. The investigation painted a harrowing picture of recurring violence, endured in silence by the helpless infant.
During subsequent interviews, Munoz gave chilling insight into her motives, acknowledging that anger stemming from her relationship with the baby’s father had fueled her outbursts toward Hazel. She revealed that all three of her children shared the same biological father, but explained her violent actions as being driven by resentment linked to her personal struggles.
The Texas Rangers joined the probe as the complexity and severity of the case deepened. By March, a grand jury indicted Munoz on two counts of capital murder and a separate charge of injury to a child, all to be prosecuted in San Patricio County’s 343rd District Court. The procedural process saw attorneys weigh the possibility of an insanity defense and seek a psychiatric evaluation, the results of which remain confidential.
As both defense and prosecution prepared for trial, a plea agreement was ultimately reached in October. On October 24, Munoz formally confessed to murder and injury to a child in exchange for prosecutors dropping one of the murder charges and reducing the capital murder charge to a lesser offense.
Following sentencing, authorities transferred Munoz to state prison, bringing an end to a court saga that began with a single, tragic call for help. The case has left Mathis residents reeling from the loss of a young life, with the grim details standing as an enduring reminder that the most profound tragedies can emerge quietly in the places people call home.