A Las Vegas inmate is accused of killing his cellmate with a lethal dose of fentanyl before storing the drugs inside of his body, authorities said.

Timothy Oliver, 32, allegedly gave his Clark County Detention Center cellmate Dylan Isi, 30, the fentanyl that led to his death on Oct. 24, according to a report citing legal documents.

Initially, Isi’s death was ruled to be an accident, but an amended criminal complaint against Oliver was filed early in March by Chief Deputy District Attorney Michael Schwartzer.

The new complaint alleges the acute fentanyl toxicity that killed Isi was the product of Oliver, and it charges the 32-year-old with possession of a controlled substance by a state prisoner, sale of a controlled substance, and second-degree murder, the report noted.

Footage captured on Oct. 19 shows Oliver fetching a bag of fentanyl and cocaine from “the back of his pants” and snorting it while inside a holding cell, documents allege.

Isi then consumes the drugs, according to the documents, which cite footage reported by a corrections officer.

Within 20 minutes, Isi began to experience a medical emergency and had to be resuscitated by paramedics, who rushed him to University Medical Center, where he died days later, according to the report.

A strip search led officers to discover the drugs inside Oliver’s anal cavity.

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“LVMPD takes every opportunity to mitigate drugs and contraband from entering the Clark County Detention Center,” a Las Vegas Metropolitan Police Department spokesperson said. “We have layers of physical searches along with the use of a body scanner to detect concealed contraband. We also utilize a wellness monitoring device for those that are experiencing detox from drugs and alcohol that monitors their vital signs. Medical staff ensures rapid deployment of Narcan and life-saving measures to those in medical crisis.

“The war on drugs is fought both on the street and detention facilities across the United States. … With the addition of medication-assisted treatment, programming, and increased treatment options for offenders leaving incarceration, we are dedicated to making a positive impact on community safety both inside and out of the jail,” the spokesperson added.