TOPEKA, Kan. (AP) –  A former Fort Riley nurse has been indicted on federal charges of stealing fentanyl, a powerful painkiller.

According to a statement Wednesday from U.S. Attorney Barry Grissom, 56-year-old Lana Pendergast is charged with one count of unlawfully obtaining a controlled substance.

Prosecutors say that while Pendergast worked as a nurse at Irwin Army Hospital she began taking fentanyl for her own use, replacing the fentanyl with saline.

It is unclear if Pendergast has an attorney.

If convicted, Pendergast faces a maximum of four years in federal prison and a fine of up to $250,000.