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ST. LOUIS (AP) — Federal prosecutors are asking a judge to schedule a hearing to determine whether a suspected serial killer is mentally competent to stand trial.

The U.S. Attorney’s office filed a motion Tuesday seeking the hearing for 26-year-old Perez Deshay Reed before trial on federal gun charges.

Perez is charged with killing a total of six people in the St. Louis area and in Kansas City, Kansas. The federal charge against him is transporting a gun across state lines with the intent to commit a felony.

State and federal investigators said Reed used the same weapon in all six killings.