He said both. After he attacked brooke and when he shot Q he said ''Have a nice night'' after he talked to brooke in his house he said ''have a nice day''
don't know if anyone one else noticed this, but the flashback from season 6, Xavier says to brooke "have a nice night" ...but on the flashback then he said have a nice day, like wtf.. how did they change that.
Second-degree murder would be maybe fifteen to twenty-five years but given that he murdered him in Cold blood and then stole his wallet he probably would have gotten life in prison without parole. I guess Mark Schwahn got lazy and decided to just recycle a few characters to create more drama. I'm pretty confident that if it was Sophia Bush that left the show and Hilarie Burton that stayed this probably would have been Derek.