In the defendant's convictions for tampering with physical evidence and hindering apprehension in connection with a murder, the State impermissibly withheld evidence of a punishment-phase witness's inability to identify the defendant in a photo line-up and that prosecutors had thereafter prepped the witness before trial by showing him a single photo of the defendant. The potential impeachment evidence against the taxi driver who testified to the defendant's comments and demeanor was material. Had this evidence been disclosed and used effectively, it would have placed the State's case for punishment in a different light, giving rise to a potentially different outcome. Hall v. State - 03-07-00626 and 00627 CR