A Crow Agency woman convicted in a large conspiracy that brought pounds of nearly pure meth to Montana from California will spend five years in federal prison.

U.S. District Judge Susan Watters on Thursday followed a prosecution recommendation and sentenced Mary Rock Big Man, 37, to five years.

Rock Big Man pleaded guilty earlier to possession with intent to distribute and to conspiracy to launder money.

Rock Big Man apologized and said, “What I did was wrong.”

Rock Big Man is among nine defendants convicted or charged in a trafficking case in which prosecutors said people brought meth to Billings, Lockwood and Crow Agency for distribution from about 2014 to 2015.

Investigators identified Rock Big Man as a local dealer for others who were transporting multi-pound quantities of meth from San Jose, California. Rock Big Man allowed co-defendants to store meth at a storage unit business in Hardin where she worked.

Rock Big Man also admitted trying to wire $3,500 in cash proceeds to a person in the organization but was unsuccessful. She then opened an account at Wells Fargo Bank so the money could be transferred.

“You were right in the thick of it,” Watters told Rock Big Man.

The judge followed a sentencing recommendation from Assistant U.S. Attorney Lori Suek and noted that Rock Big Man had mental health and substance abuse issues that needed treatment. She also said Rock Big Man had a difficult childhood and suffered from trauma and post-traumatic stress disorder.

Defense Attorney June Lord of Great Falls recommended a two-year sentence.

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Federal Court, Yellowtone County Reporter

Federal court and county reporter for The Billings Gazette.