Linda Diane Sherrow faces up to five years in prison when she returns for sentencing April 21 in U.S. District Court in Los Angeles.

The former California Institution for Men correctional officer entered the guilty plea to perjury Wednesday.

The 49-year-old Sherrow lied to the grand jury in 2004. The panel was investigating fellow officer Shayne Ziska, who had helped inmates associated with the Nazi Low Riders prison gang.

Ziska was eventually sentenced to more than 17 years in prison for racketeering and civil rights allegations.