Inmate's overdose death raises questions about jail drug screening 12 News Investigates is asking questions about how drugs got into the Milwaukee County Jail that led to an inmates death. A suspect is now in custody.

U.S. Marshals swarmed a house near 28th and Wright streets Monday afternoon and arrested 37-year-old John Luckett. Prosecutors say Luckett had drugs inside the Milwaukee County Jail in May 2025, and he's charged with giving them to his cellmate, who later overdosed and died.

That cellmate, 33-year-old Gabriel Muniz-Jimenez, died of an overdose after he was found unresponsive in his cell on May 21, 2025. Prosecutors say he had fentanyl, heroin and cocaine in his system.


Luckett was charged in May 2025 with having drugs inside the jail, on top of the gun charges that sent him to jail in the first place. Prosecutors filed the reckless homicide charge in January, but didn't arrest Luckett until Monday.

Muniz-Jimenez was in custody since April 2024 for possession of methamphetamine. His criminal complaint says he told officers unknown people had been after him for a year, but no one believed him.

 The defendant then told officers he had illegal street drugs and he wanted to be arrested so he could be taken to a safe place,  Muniz-Jimenez's complaint reads.

His sister, Cassandra Jimenez, tells WISN 12 News her brother struggled with mental health issues and used drugs to cope.

 It doesn't matter if my brother passed away from an overdose,  she said.  He was a good person. 

She questions how drugs got into the jail in the first place.

 Milwaukee County Jail has to check everyone,  she said.  How is it possible that my brother passed away in jail for drugs? It's not making any sense to me. 

A criminal complaint for Luckett says West Allis Police searched him on May 20, 2025. When he got to the jail, he went through a metal detector, pat-down, and a body scan.

 ... if the baggies of drugs were tucked well into the genital area or swallowed...  the complaint reads, saying the bags would be difficult to detect.

The Milwaukee County Sheriff's Office did not re

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