The final defendant charged in a botched robbery attempt pleaded guilty in July, and his sentence will be determined from potential options with requirements based on age.

The final defendant charged in a botched robbery attempt pleaded guilty in July, and his sentence will be determined from potential options with requirements based on age.

Austin M. Anderson, of Hannibal, 16, entered a guilty plea to the Class B felony of attempted robbery before Judge Rachel Bringer Shepherd on Monday, July 3, in Marion County Circuit Court. Raymond Legg represented the defendant. Marion County Prosecuting Attorney David Clayton represented the state.

Shepherd accepted a request from Legg to review sentencing options like a 120-day intensive treatment program through the Department of Corrections (DOC) or a dual jurisdiction sentence through the Department of Youth Services (DYS) — which would suspend the adult DOC sentence while imposing a youth sentence at a DYS facility. If that option is selected, the Court would decide if Anderson would remain in DYS custody, be placed on probation or transferred to the Department of Corrections when he turned 17 years old.

Anderson’s charge stemmed from a botched robbery at Ronald Gillum Jr.’s home at 1737 Park Ave. Court documents alleged that Willemarck, John Newman and two co-defendants — Willemarck’s younger brother Anderson, and Stephanie Pettitt — planned to rob Gillum. According to the probable cause statement, Willemarck and Newman armed themselves with guns, while Anderson carried a “baseball bat type” object and Pettitt acted “as a look out.” Newman knocked on the door and shot Gillum in the abdomen after the door opened. The robbery attempt was foiled when Gillum managed to close the door. The four fled the scene.

Three co-defendants, including Anderson’s older brother, Thomas P. Willemarck III, of Hannibal, have already been sentenced in the case. Willemarck was sentenced to a 120-day Department of Corrections treatment program, and he would serve a 10-year prison term if he failed to complete the program. John Newman pleaded guilty to felony charges of attempted robbery, armed criminal action and second-degree assault. He received a 15-year prison sentence. Stephanie Pettit, who allegedly served as a “lookout” during the robbery attempt, received probation for her cooperation against the other defendants in the case.

Shepherd will discuss the various sentencing options along with Anderson's eligibility requirements during a sentencing hearing at 1:30 p.m. Wednesday, Jan. 3.

Anderson remains incarcerated in the Marion County Jail.

Reach reporter Trevor McDonald at trevor.mcdonald@courierpost.com