On January 2, 2022, 22-month-old Aviyana Ramona Montoya was found unresponsive in her crib at the family's home in Brighton, Colorado, after being left unattended for nearly 14 hours. Her parents, Alonzo Montoya and Nicole Casias, had been using and selling drugs — including fentanyl and cocaine — in the home. Aviyana, who was born with a cleft palate and was teething at the time, had been in the master bedroom where drug activity was taking place before being placed in her crib around midnight. Surveillance cameras captured the child crying, coughing, and gasping for breath for over six hours as her condition deteriorated, but neither parent checked on her. Her blood contained fentanyl at 10 times the lethal amount for an intolerant adult user, and her hair follicles tested positive for extended exposure to cocaine, methamphetamine, and marijuana. She also had pneumonia at the time of death. The cause of death was fentanyl toxicity, with the manner of death ultimately ruled undetermined. Both parents were convicted: the father was sentenced to 40 years in prison and the mother to 22 years.
Contexts/Conditions
Is there any mention of child drug ingestion or overdose?
Multiple sources explicitly describe the child's death as the result of fentanyl ingestion/overdose. The fatality report states the child's "blood tox[icology] was positive for meth[amphetamine] and a very high level of fentanyl. The fentanyl level was 30 nanograms/mL…. Fentanyl toxicity [was] the cause of death." The KKTV article states the child "died as a result of ingesting fentanyl." The DA press release states the coroner determined "Aviyana had 10 times the amount of fentanyl in her system needed to kill an intolerant adult user."
Is there any mention of a drowning incident (either intentional or accidental)?
Is there any mention of a firearm incident?
Is there any mention of inappropriate supervision (e.g., child wandered off and drowned)?
The fatality report states the mother "admitted that after putting [the child] down [around 2:00 a.m.] [the mother] didn't check on her again for 12-14 hours." The CFRT listed "The child had been left alone/unsupervised for a long period of time" as a contributing factor. The DA press release states "No one checked on Aviyana for nearly 14 hours." During this time, the parents were using and selling drugs instead of monitoring the child.
Is there any mention of inflicted injury? (e.g. slapped, punched, kicked, choked)
Is there any mention of malnutrition, starvation, or dehydration?
Is there any mention of medical neglect?
The fatality report documents two prior assessments for medical neglect. The first (4/2/2020–5/1/2020) describes how "the child had started losing weight following her discharge from Children's Hospital Colorado" and "the parents were asked to take the child to CHC for further evaluation. However, they did not take the child to CHC." The second (6/7/2021–7/20/2021) describes concerns that "the child was not seen for an additional follow-up medical appointment after her surgery at CHC" and "had not been seen by her primary pediatrician since December 2020." The CFRT also identified "Unmet medical needs for the child" as a contributing risk factor.
Is there any mention of a motor vehicle crash or incident?
Is there any mention of a murder-suicide incident?
Is there any mention of outdoor elements (including hot car deaths)?
Is there any mention of prenatal substance exposure (including fetal alcohol syndrome or neonatal abstinence syndrome)?
Is there any mention of sexual abuse?
Is there any specific mention of shaken baby or abusive head trauma?
Is there any mention of prolonged abuse or torture (including restraints, captivity)?
Is there any mention of an unsafe sleeping environment?
The fatality report explicitly lists "Unsafe sleeping environment" as a risk and contributing factor. The report also describes the child's room as "cluttered, with 'a lot of stuffed animals in [her] crib,' and 'a roll of tin foil in her room.'"
Individuals Involved
Was an adoptive parent or guardian involved in the death?
Was a biological father involved in the death?
Alonzo Montoya was the child's biological father. The fatality report identifies him as the "Father" and the DA press release identifies the child as "Alonzo's 22-month-old daughter." He was convicted of child abuse resulting in death and sentenced to 40 years in prison. He was running a drug-dealing operation out of the home, exposed the child to fentanyl and other substances, and failed to check on her for nearly 14 hours.
Was a biological mother involved in the death?
Nicole Casias was the child's biological mother. The fatality report identifies her as the "Mother" and she is described as the primary caretaker. The Denver Post article states she "pleaded guilty to both felony charges" and was sentenced to 22 years in prison for child abuse resulting in death. She put the child to bed and did not check on her for 12-14 hours, and participated in the drug activity in the home.
Was a day care worker, babysitter, or nanny involved in the death?
Was a female paramour or friend involved in the death (e.g., girlfriend, stepmother)?
Was a foster parent involved in the death?
Was a male paramour or friend involved in the death (e.g., boyfriend, stepfather)?
Was another adult relative involved in the death? (e.g., grandfather, aunt)
Was a sibling involved in the death?
Child Characteristics
Was the child adopted?
Was the child homeschooled (including "cyberschooling") or taken out of school?
Was the child in foster care at the time of the incident?
Was the child living with relatives at the time of the incident (but not parents)?
Is there any mention of a neurological developmental child disability? (e.g., autism, intellectual disability, nonverbal)
Is there any mention of a physical child disability? (e.g., feeding tube)
The fatality report states "The child was born with a cleft palate, which required surgery to correct." The timeline further notes the child had "a cleft lip and palate and had difficulties eating." The child required surgery at Children's Hospital Colorado to correct the condition and had follow-up medical needs. The CFRT also identified "Vulnerable Child – due to age and medical needs" as a contributing factor.
Is there any mention of prematurity or low birthweight?
Is there a history of child protection reports prior to death (for this child or siblings)?
The fatality report documents two prior assessments by Adams County Human Services Department. The first (4/2/2020–5/1/2020) involved medical neglect concerns about the child's weight loss and failure to take the child for evaluation. The second (6/7/2021–7/20/2021) involved concerns about missed follow-up appointments. Both resulted in unsubstantiated allegations. The report states: "Within the last three years, the family had prior involvement with Adams County Human Services Department consisting of two assessments."
Does the child have a history of foster care (but not in care at time of incident)?
Is there a history of a sibling death (separate incident from this death)?
Parent/Caregiver Factors
Was an adult charged or arrested for the child's death?
Both parents were arrested and charged. The fatality report states: "the parents were arrested and were both charged with 'Child abuse Resulting in Death… and… Distribution of a Controlled Substance.'" The Denver Post article reports the father "was convicted of child abuse resulting in death, racketeering and other charges in January and sentenced to 40 years in prison." The mother "was sentenced Tuesday to 22 years in prison for child abuse resulting in death."
Is domestic violence by the parent/caregiver referenced?
Is there any mention that the death occurred in a temporary shelter or while homeless?
Is an intellectual disability of the parent/caregiver referenced?
Is the mental health of the parent/caregiver referenced?
The fatality report's CFRT identified "The mother's mental health struggles" as a risk and contributing factor that may have led to the incident. While the mother "denied a history of… mental health issues" and the father also "denied having any mental health issues," the CFRT independently identified the mother's mental health as a contributing factor based on their review.
Is a history of arrests or criminal charges for the parent/caregiver referenced?
Both parents had extensive prior criminal histories predating the fatal incident. The fatality report states the mother's "criminal history included charges of driving while under the influence and other traffic offenses." The father's "criminal history included charges of possession and distribution of dangerous drugs, assault, theft, false reporting, impersonation, forgery of government documents, and driving under the influence." Additionally, in July 2020, "the parents were stopped by another law enforcement jurisdiction, with the child in the car, and they were found to have several narcotics and paraphernalia in the car. The father took responsibility for everything and had charges, including child abuse charges, pending from that situation."
Is substance use by the parent/caregiver referenced?
Substance use by both parents is extensively documented across all sources. The fatality report states the mother "struggled with chronic substance use. At the time of the child's death, the mother's drug of choice was crack cocaine." The father "also was reported to do well when he was sober, but often reverted back to substance use, including using crack cocaine and Fentanyl, while also using Methadone. The father also sold Fentanyl to help fund his cocaine use." The CFRT identified "Both parents had a significant substance abuse history" as a contributing factor.
Notable Details
Several notable systemic and legal details emerge from the documents. First, first-degree murder charges against both parents were dismissed by Judge Don Quick, who ruled there was "not evidence that either Defendant gave fentanyl to the child, knew the child had consumed fentanyl or had let the child roam free overnight with fentanyl being available within easy reach" (Denver Gazette). This illustrates the significant legal challenge of prosecuting fentanyl-related child deaths. Second, the fatality report notes the manner of death was changed from accidental to undetermined following additional toxicology results. Third, the CFRT identified a systemic gap in that no report of concern was made to child welfare when the father was stopped with narcotics and the child in the car in July 2020 and faced child abuse charges. The CFRT formally recommended that MOUs between county departments and law enforcement highlight requirements around making reports to child welfare when there is a crime of child abuse. Fourth, the Denver Gazette article notes the child was "the first of several Colorado children under 14 to die of fentanyl-involved poisoning in 2022," placing this case in the broader context of Colorado's fentanyl crisis. Fifth, the DA press release describes how surveillance cameras showed the child "playing on the bed in the master bedroom where individuals were using drugs and drugs were present" and "was seen placing items in and around her mouth" while teething — providing critical context for how the ingestion likely occurred.
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