Nathan shows up at Millie's. She's surprised, especially when he asks about Kelly, since no one ever wants to talk to her about Kelly. He says he was going through some old stuff and got to thinking about Kelly, so wondered if Millie's heard from her. She says she wishes she could say yes, that she's been living in France, is an artist, has a daughter named Francois, but she doesn't know anything. He asks if she's ever wondered if Kelly didn't really run away, and she says she actually suspected Nathan knew more than he let on and she even hired a private investigator, but Kelly used her credit card to buy a one-way ticket to London and she hasn't heard from her since. He wonders if that's not what really happened, but Millie says Kelly was always willful and when you add to it that Millie wasn't the most attentive of mothers, it all adds up. Millie tells Nathan she has a hair, nail, and body-sculpting thing she doesn't want to be late for, so he can show himself out. He touches a statue by the pool and flashes back to a younger Nathan (played by a different actor, but wearing the tell-tale plain baseball cap) with Kelly. They're having fun by the pool, and Kelly's flirty and pressuring Nathan to take full advantage of her. They're drinking. She takes his cap and backs off. Then the flashback ends, so Nathan touches the diving board and sees her back teasingly away from young Nathan until she falls and hits her head, landing in the pool and bleeding. I guess that answers that question. Not that any of us ever knew or cared about it until now, so I can't really muster up any strong reaction either way. Especially since it was an accident.
Nathan's meeting Mama Petrelli in a shady bar. He asks why she wanted to see him, and she says Millie called to tell her that he was asking questions about Kelly. She says that his trip down memory lane is hurting Millie. Nathan says Kelly didn't disappear, she died, and he was there. What he wants to know is why he can't remember it. I would settle for, "Because he's Sylar," being the explanation here, and I actually think he remembers much more about being Nathan than he logically should, even in the Heroes-verse. But after some denial, and this lovely exchange -- Nathan: Because every time there's a secret buried someplace, I find you with a shovel behind your back. Angela: You should write Mother's Day cards. -- Mama Petrelli reluctantly admits that she had the Haitian wipe his memory, she disposed of Kelly's body, and she bought the plane ticket. He says it was an accident, but she says it didn't look like one and she couldn't let that happen to him. She tells him to go ahead and vilify her for this, but not to destroy his life over it now. He wonders if she's going to let her friend go on telling herself her daughter ran away because she was a bad mother. Mama Petrelli says Millie's made her peace with it and leaves.