|Cause of Death episode|
| Bad Medicine |
Volume 1, Episode 3
|Air date||December 16, 2010|
|Volume 1 guide [v]|
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Volume 2: The Connoisseur
The team is at East Beach, the site of the bonfire party, investigating Brittany Emerson's murder. Mal notes that the Maskmaker is beginning to get sloppy and make mistakes, as Brittany was clearly killed on an impulse. Mal and Natara then travel to the Emerson residence to question Brittany's family.
Back at the crime scene, Amy Chen and Eric Mills are searching the beach for evidence. Amy discovers some pieces of broken glass- later revealed to be the remains of a vial containing succinylcholine. The vial is traced to a Dr. Christian Rose, who spent ninety days in prison after deforming a woman's face by performing plastic surgery while high on painkillers.
Natara believes Dr. Rose is the Maskmaker, as he matches her profile and also has a motive and access to paralytics. Mal, however, is not convinced. The two arrive at an abandoned warehouse, where Rose has been performing under-the-table operations after his release from prison. Inside, Dr. Rose is operating on Miguel Flores, a highly-ranked member of a notorious Mexican cocaine syndicate known as the Flores cartel. After a failed attempt to escort Dr. Rose to the precinct for questioning, a shootout ensues, ending in Miguel Flores' death and Rose's escape.
Captain Yeong is convinced that Dr. Rose is the killer, and refuses to listen to Mal's explanation of why he is not. She officially names Rose the primary suspect in the Maskmaker investigation during a press conference, and instructs all SFPD officers to search for him.