She shows up at a crime scene to meet her partner Tess (Nina Lisandrello), who says she should have tased the guy who was only into her for the handcuffs, apparently. Tess has a terribly thick New York accent that is so muddled it could be from any of the boroughs. Tess is on a man cleanse, because guys are just the worst. They turn away from their personal discussion to do their jobs, which involves checking out the murder victim in the middle of an upscale hotel and discussing her pricey Louis Vuitton handbag.
Looking at the security footage with her boss Bishop (Brian White), they see that the victim was injured prior to stumbling into the hotel. So while the concierge is all uppity about the fact that it's a nice hotel, clearly someone didn't do their job. Tess reassuringly comes over to identify the victim as Ashley, the editor for some made up fashion magazine, a fact she learned from Google. Our tax dollars at work, everyone. Catherine fills in the info that the victim's husband is a famous photographer and the two were fodder for Page Six. Guess someone has time to read the Post when she's not solving crimes.
Using some very fancy computer technology, they take the fingerprint they found on a button and enlarge it to reveal that it belongs to a once Vincent Keller. Turns out that he is a dead doctor who was killed in Afghanistan. He was an ER resident at St. Benjamin's and when Catherine pulls up his picture, she just stares at it for a very long time.
At the hospital, a helpful nurse happily spills that Keller was a nice, not-cocky-at-all doctor who lost his brothers on 9/11 and spent the whole day waiting for them to show up. Then he disappeared and stopped working, and apparently went to war. When they ask the nurse if she's seen him, she looks at them like they are morons. While this may not be far from the truth, they move on to ask if he had any friends that he might have reached out to. He was anti-social, but he had a roommate named J.T. (Austin Basis), who is a chemical researcher and lives in some old decrepit factory near a Brooklyn Bridge that is about the size of the one in Las Vegas. Catherine jokes about him maybe running a meth lab, giving Tess a chance to poke fun at Catherine's poor taste in men. It's this show's idea of a running joke, apparently.
They enter the big old warehouse that looks mostly empty, and head towards a spot marked Office. He's in there and watching TV. It's the one spot that looks like an actual room, instead of a dark dank space. If he can turn this little space into something habitable, why not expand? Make some money? Real estate is prime in New York. Anyway, J.T. (played by Math from Life Unexpected, doing another version of his geeky character), looks perplexed by the detectives asking about Vincent. While Tess asks New Math about Keller, Catherine wanders, seemingly aware that someone is looking at her from some nebulous place in the warehouse apartment. She sees stairs and a locked gate and asks if they can take a look around. New Math politely says that he has to leave to teach a biochemistry class. As they leave, Tess makes a joke about how Catherine should sleep with New Math in order to get in without a warrant. Professional!