The Russian wife of Enrique Marquez Jr., the man accused of conspiring with the shooters in the San Bernardino terror attack, pleaded guilty Thursday to entering into a sham marriage with Marquez and lying to the FBI.

In a Riverside courtroom, Mariya Chernykh, 26, entered the plea to federal charges of conspiracy and perjury, according to the U.S. attorney’s office in Los Angeles.

Appearing before U.S. District Judge Jesus Bernal, Chernykh admitted to putting false statements on her immigration paperwork, lying to FBI agents during her interviews, and giving Marquez regular payments for his continued involvement in the sham marriage.

Bernal could impose up to 20 years in prison and a $1-million fine at Chernykh’s sentencing, scheduled for Nov. 20.