Prosecutors have charged the Rust film armourer with evidence tampering in connection to the fatal shooting of cinematographer Halyna Hutchins.
Hannah Gutierrez-Reed has already been charged with involuntary manslaughter.
She will face an additional charge in relation to “the transfer of narcotics to another person”, prosecutors said.
Ms Gutierrez-Reed will plead not guilty to the new charge, her lawyer said, calling it “retaliatory and vindictive”.