Lamar Burgess (Max Von Sydow) is the one who set up Detective John Anderton (Tom Cruise) for the murder. He did this because Anderton was on the way to figuring out that Burgess murdered Anne Lively (Jessica Harper), mother of Pre-Cog Agatha (Samantha Morton). Burgess hired a drifter to attempt the murder for the Pre-cogs to predict, and actually committed it as the drifter was being arrested. The Pre-Cogs did not notice when Burgess actually murdered Ann Lively, because he did it in exactly the same manner that he had arranged for the drifter to do, so they thought it was an "echo," which is when the Pre-Cogs re-experience previous visions of murder.
Thanks, M Lingo!
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