Four jurors have already been selected. The process is expected to take the rest of the week.
The trial will also play host to the state's experiment to allow news cameras in the courtroom.
It's part of an effort to increase transparency. But, some judges and lawyers are worried it'll disrupt the proceedings.
Sheley is accused of killing 93 year-old Russell Reed of Sterling. He's already been convicted for killing Ronald Randall of Galesburg and he faces trials in the deaths of six others.