Meanwhile, Sara is suffering her own private hell as she matches up umpty-jillion shredded pieces of rubber against the bus and Camaro tires. At least she has some pleasant background music to keep her company as she does so. The music keeps playing as Brass questions people at the rest station in Barstow. A gas-station attendant reports that Marty Draper was a regular; a female attendant points out that she was being ogled by someone who bought a lot of turkey jerky. She also noted a fight between a couple. Brass then talks to a mechanic (note: he's the only one wearing a nametag. It reads "Sean") who can recite the particulars of the bus route. Sean did not notice the couple fighting. The background music kicks up again as Sara continues to work with the rubber tire fragments, swabbing the pieces that match for chemical residue.
While this is going on, Nicky's managed to slide into the Camaro for a look around. Catherine comes over, and they comment on the lack of a wallet anywhere on Eric's person; Nicky has a flash of intuition, reasoning that sitting on a wallet for four hours would be uncomfortable, and therefore it's likely that Kevin took it out. He finds the wallet in the beverage caddy. Now why can't Nicky display these thinking skills around Gil, Warrick, or Sara? Does he have performance anxiety? Is he self-sabotaging? Are they so collectively brilliant that anyone else's IQ falls when in their presence? It's a mystery to me. Anyway, once Catherine gets the wallet, they flip it open, and there are many, many pictures of the girlfriend in the wallet. Nicky recognizes the girl from the accident scene.
Cut to Nicky and Catherine at the girlfriend's bedside. Catherine's all, "He said he wanted to surprise you." The girl nods weakly, then says, "He did. In Barstow, at the rest stop. It was supposed to be a girls' weekend." We go to flashback, where we learn that Eric is a mite bit possessive, needy, and insecure. The woman expresses remorse for having yelled at the man who explicitly ignored her plea for space and, as a result of deciding to follow her around, ended up dead as a result. Catherine and Nicky move on to solve the mystery of the DNR. The girl explains, "It's because he was a doctor. He saw it every day, people hooked up to machines, waiting to die. He swore he wouldn't want anyone he loved to go through that. And if his life was at stake, he would make the hard decision so no one else would have to." They all fall silent, thinking, "Hunh. The recapper called this one ten minutes ago."