A second former Memphis police officer changed his plea to guilty on Friday in connection to alleged civil rights violations that ended in the beating death of Tyre Nichols.

A change of plea for former officer Emmitt Martin was entered in the courtroom of U.S. District Judge Mark Norris, records showed.

Back in November, another former Memphis officer, Desmond Mills Jr., changed his plea to guilty to federal charges of excessive force and obstruction of justice. The defendant agreed to cooperate with prosecutors and face up to 15 years behind bars.