Missouri death row inmate Marcellus Williams was executed by lethal injection Tuesday for the 1998 murder of Lisha Gayle.

Missouri is set Tuesday to execute Marcellus Williams, a death row inmate whose case has spurred several efforts to save his life amid doubts about the evidence presented at his 2001 murder trial and the actions of a trial lawyer in the case.

Missouri death row inmate Marcellus Williams has been executed despite admissions from a prosecutor’s office claiming his innocence. Williams had been convicted of the 1998 murder of Lisha Gayle, a former reporter for the St. Louis Post-Dispatch.