Among the flashbacks Sylar sees when Matt manipulates his mind is the one with Charlie being killed, despite the fact that Hiro went back in time and undid this particular event earlier this season.
Sylar: You did it. My powers are gone.
Matt: No, they're not gone. They're just buried. Somewhere that you can never get to them. You've threatened my family for the last time.
Sylar: What did you do?
Matt: I know exactly what scares you, Gabriel. And it is being alone with your immortality.
Sylar: What did you do to me?
Matt: I have trapped you inside your twisted mind. You're gonna be alone, Sylar... very much alone... in this nightmare that will last forever. And the best part of that is when I leave here, you're not gonna remember what I did. You're gonna live every empty day like it's real.
Sylar: You said you would help me.
Matt: Yeah, well, I guess there's still a little of you left inside me... because I lied. Enjoy hell.
Sylar: All I know is that once I'm free from the temptation of my ability...
Matt: Mm-mm? You're going to be normal? I'm sorry, that ship sailed 50 murders ago.
Australia: March 18, 2010 on 7TWO
UK: April 24, 2010 on BBC2
Latin America: May 4, 2010 on Universal Channel
Germany: December 9, 2010 on RTL II
Czech Republic: March 18, 2011 on Prima COOL
Finland: May 11, 2011 on Sub