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Shaker visits Mullen's house, and holds Mullen at gunpoint once he realizes Shaker's identity. Shaker takes him outside, but Mullen's son recognizes Shakers voice and alerts the authorities. Mullen uses a distraction to overpower Shaker, and he chases him through the streets, which ends in a brutal fight between the two in which they crash through a store window. The police arrive and everyone holds Shaker at gunpoint, including Mullen. Shaker pulls a gun and Mullen opens fire, killing him. Edit
When Det. Shaker "rescues" the kid, the kid listens to him as he identifies himself as a cop. Later when Shaker is in Mullen's house to collect the reward, the kid listens to him also, but this time he recognizes his voice and pees in terror, which tipped Mullen thus giving the next twist in the story. But why didn't the Kid recognize him the first time?
Shaker might not have said anything to Sean when he first entered the room. When the SWAT team burst in, all Sean hears Shaker say is, "I'M A COP! I'M A COP!" in a desperate, exasperated tone. Sean may not have recognized the voice then because his emotions were mixed at that time given the relief he would have felt. Plus hearing Shaker tell SWAT he was a cop will have thrown him off. Sean could easily have believed Shaker. Edit