Carl Van Loon: You do not know what I know because you have not earned those powers. You're careless with those powers, you flaunt them and you throw them around like a brat with his trust-fund. You haven't had to climb up all the greasy little rungs. You haven't been bored blind at the fundraisers. You haven't done the time and that first marriage to the girl with the right father. You think you can leap over all in a single bound. You haven't had to bribe or charm or threat your way to a seat at that table. You don't know how to assess your competition because you haven't competed. Don't make me your competition.
Carl Van Loon: Your powers are a gift from God, or whoever the hell wrote your life script.
Eddie Morra: I was blind, but now I see.
Eddie Morra: What's the asking price?
Realtor: $8.5 million.
Eddie Morra: I'll take it.
Carl Van Loon: So, Eddie Morra... And you do know you're a freak? What's your secret?
Eddie Morra: Medication.
Eddie Morra: A tablet a day, and I was limitless.
Answer: Although there is no definitive proof, I believe the killer to be Atwood's henchman. During the trip scene we see him following Eddie and the Blonde to their room and although it comes off as an illusion there's no reason it cannot be real. This alone is not enough to say for certain but the main reason I point to the henchman is because of how the story plays out following the murder. Eddie is by an eyewitness (probably someone working for Atwood if not the actual killer) who tells the police about him and as a result he is called into questioning. Because of the inquiry Eddie hires "the best lawyer in the city" who as we know is under Atwood's thumb. It is during this line of questioning the lawyer is able to go into Eddie's jacket and steal his NZT. None of these things would have happened had the Blonde never been killed.
dream3ater