KANSAS CITY, Mo. (AP) — Jury selection is expected to take up to a week in the capital murder trial of a Missouri man who claims he was morally obligated to kill three people at two suburban Kansas City Jewish sites.

Frazier Glenn Miller Jr, also known as Glenn Cross, has publicly admitted firing the shots that killed 69-year-old William Corporon, 14-year-old Reat Griffin Underwood and 53-year-old Terri LaManno on April 13th, 2014. The 74-year-old avowed white supremacist says he didn’t know none of the victims was Jewish.

Miller is representing himself in a case that could result in the death penalty. Johnson County Judge Thomas Kelly Ryan has warned him that any outbursts in front of jurors could result in a mistrial.

Ryan ruled last month that Miller can’t use “compelling necessity” as a defense for the killings.