SALINA, Kan. (AP) — A woman from Mexico who tried to hide a gun that her boyfriend used to fatally shoot a Salina teen has pleaded guilty to a federal gun charge.

The U.S. attorney’s office says 22-year-old Azucena Garcia-Ferniza admitted Tuesday to one count of possession of a firearm while unlawfully in the United States.

Federal court documents say Garcia-Ferniza legally entered the U.S. at the age of 3. She had a current permit to work in the U.S. at the time of her arrest, but her visitor visa expired in 1998.

Authorities say Allie Saum was killed in May 2015 when she was a passenger in a pickup truck that was mistaken for someone else’s truck. Garcia-Ferniza’ boyfriend, Macio Palacio Jr., has been sentenced to life in prison.