WICHITA, Kan. (AP) — Prosecutors have announced plans to seek the death penalty against a man charged with killing his adoptive parents with the help of his biological mother and two friends.

KSNW-TV reports that the Sedgwick County district attorney made the announcement Wednesday after Anthony Bluml pleaded not guilty. He is charged with capital murder in the Nov. 15 shootings of Roger and Melissa Bluml outside the couple’s rural Valley Center home.

Melissa Bluml died the next day, while her husband died about five weeks later.

The defense lawyer requested a separate sentencing from Bluml’s co-defendants. One co-defendant agreed earlier this month to testify against Bluml, his biological mother and a friend of Bluml in exchange for facing a reduced charge.

The trial date is set for Nov. 17.