An exterminator investigates an infestation at a home renovation.

The maggots have been attracted by a dead body inside the wall.

At the scene, Catherine gives grief to Beau, her late-arriving partner.

His excuse was dropping off an inhaler for his difficult freshman daughter.

Maxine and Nora go over the agenda of Josh's review board hearing.

The corpse was Benji Hearon, a Frank Sinatra impersonator.

The team discovers the maggots were there from a Joey Bishop impersonator also found in the wall. "Joey" was Sam Carriman, who had been missing for a week.

Catherine finds a feather up Sam's nose.

Serena and Beau question any of the impersonators who worked with the dead men last, collecting any feathers from their costumes.

The Dolly Parton impersonator says that Benji and Sam were arguing at that last gig.

Jack postulates that the victims were attacked with the same blade but perhaps not by the same attacker.

Jack discovers a rat-poison pellet in Benji's stomach.

Allie and Beau ponder Folsom's upcoming hearing.

At the hearing, Nora reviews all the incriminating evidence against Josh.

A conflicted Max testifies that Folsom's actions should prohibit him from continuing in law enforcement.

Chris determines Benji was still alive when he was sealed up in the wall.

Chris and Penny try to figure out why the knife wounds were so different.

They decide that the killer was a southpaw with an injury to his dominent hand.

The DNA results suggest the two victims fought and injured each other. But someone had to put them both in the walls.

Beau and Chris recreate that fight based on evidence recovered from the plastic sheeting wrapped around the bodies.

New evidence points to Doug, the Dolly Parton impersonator. But he reveals that Linda, the agency head who is pregnant with Benji's chjld, saw Doug and Benji get back together.

Allie urges Josh to testify since he's the only one who knows what really happened.

Folsom does testify, explaining what went down in Tarquenio's hanger.

Beau's analysis proved that the maggots had Linda's perfume in their system. So she had to have been at the murder scene.

Beau unveils blood spatter on Linda's wheelchair which couldn't have landed there unless she was standing.

The review board decided to terminate Josh. But Max's spirited defense of him gets him a one-month suspension instead.

Then Max busts Folsom down to a CSI Level 1.