Austin Woman Charged in Fatal Domain Overdose Case
The 21-year-old suspect faces a felony charge after an 18-year-old died from the toxic effects of pills sold in July.
Updated on Oct. 29, 2026 in Drug Crime
Austin police have charged 21-year-old Duneska Marquez with the manufacture or delivery of a controlled substance causing death following a fatal overdose at a Domain-area residence. Investigators allege that Marquez sold four pills to a witness one day before 18-year-old Carson Jack Ingram was found dead on July 9.
Why it matters
The case highlights the ongoing danger of counterfeit pills in Austin as authorities work to trace the supply chain behind fatal overdoses. It also serves as a reminder of the legal consequences for individuals linked to the distribution of substances that result in deadly toxicity.
Investigators identified a transaction involving four pills sold for $80 prior to the death of an 18-year-old at a Domain address. The medical examiner confirmed the fatality resulted from N-propionitrile chlorphine and diphenhydramine toxicity, though the full lab analysis is ongoing.
The players
Duneska Marquez
The 21-year-old accused of delivering a controlled substance that resulted in a fatal overdose.
Carson Jack Ingram
The 18-year-old who died due to the toxic effects of N-propionitrile chlorphine and diphenhydramine.
Austin Police Department
The local law enforcement agency responsible for investigating the transaction and the subsequent death.
Travis County Medical Examiner
The county office that determined the specific cause of death for the victim.
The details
Austin police detectives identified Marquez as the suspect by cross-referencing phone records, witness identification, and surveillance footage of the July 8 exchange. Following the July 9 death of Carson Jack Ingram at 11711 Domain Drive, police executed a search warrant on Marquez’s vehicle on July 16, seizing a digital scale, baggies, and cocaine. Marquez now faces a third-degree felony charge for the delivery of a substance that led to a fatal overdose.
Timeline
July 8, 2026: A witness purchased four pills for $80.
July 9, 2026: Police responded to the death of Carson Jack Ingram.
July 16, 2026: Authorities executed a search warrant on the suspect's vehicle.
October 27, 2026: An arrest warrant for Marquez was officially obtained.
The Texas Context
The charge against Marquez follows the Texas legal framework for prosecuting the distribution of substances that cause fatal injuries. This case mirrors recent efforts by local and state officials to pursue felony charges against individuals linked to the supply of dangerous counterfeit pills.
This case underscores the persistent presence of counterfeit pills within the Austin area, particularly around high-density residential hubs like the Domain. Residents should remain aware of the extreme risks associated with purchasing any pill from an unverified source.
The takeaway
This case illustrates the lethal nature of illicit pills circulating in the community. Residents should be vigilant regarding the source of any medication and recognize that transactions involving unverified pills carry fatal risks.
Further reading
For more information on how the city addresses local illicit substance trends, visit the Drug Crime section.
Source note: This article includes information reported by KXAN.
