Johna Martinez-Meth, 46, pleaded guilty to involuntary manslaughter after Adrian Sepulveda, then-46, died at California Medical Facility in Vacaville, the California Department of Corrections and Rehabilitation said in a news release.
Sepulveda, who was serving a life sentence with the possibility of parole for second-degree murder, died in May shortly after Martinez-Meth visited him at the facility, according to officials.
An autopsy revealed that the inmate "had swallowed multiple balloons filled with methamphetamine."
A search warrant was executed at Martinez-Meth's home in August, where they found "methamphetamine, balloons and glue."
Martinez-Meth was taken into custody without incident. On Feb. 21, she was sentenced to two years in prison.