Minds on Murder

Ryker joins his unit in a puzzling investigation after a weeklong profiling course in Dallas.
To add to their workload, dead bodies begin piling up around them.
The unit investigates two major cases which leave the four detectives stressed and tired.
Once they solve their first case, they turn their attention to the murders. But nothing makes sense until they find Ryker's badge number tattooed on a victim's forehead. Then, the realization hit Ryker full force.
He knew who was involved in these killings. He might not have committed the crimes, but the killings happened under his guidance. Just to satisfy himself, Ryker and his guys travel to the state prison to meet with Erik Cleggman.
Erik remains in a single cell, without speaking. He hasn't spoken since his arrest. So, how does Erik get another person to kill for him if he doesn't communicate and he has no visitors?