Part 2
When he has the shootout with the security guard/killer and he gets shot in his gun hand, he doesn't even try to grab the gun with his weak hand. He just sits there accepting his imminent death. No cop would give up like that. A couple of people wrote about the confusing ending. I think I know what the film meant to convey, but did not get across very well.
When the contract killer presumably knows he is dying, he figures it won't do him any good to kill Emmett. I guess we are to assume that as he is facing death he decides to try to do one good thing before he dies; and that is why he hands Emmett the note with the clue he got off of Emmett's answering machine. He wanted to be a detective but couldn't, so before he dies he decides to do the next best thing by helping Emmett.
In the final scene we see Emmett go to the bar that was written on the slip of paper the killer gave him. And while there he sees the tattoo parlor just across the street and thus figures out that all the girls had been to the tattoo parlor. This is supposed to be the golden clue which will crack the case. Is the serial killer the tattoo parlor owner? We never find out. That was a weak ending.

This film could have been done better, but I liked it OK. That said, I have a few complaints.
Scott Wolf has done some good acting in other films but he does not play a convincing detective in this film. And the script was poorly written.
When he goes into the park without backup trailing the suspect, he calls out that he is a cop from about 40 yards away. He could have closed the distance a lot more than that. He just allows the suspect a head start Then when he gets on the radio he just says "he's running". His partner has to ask "which way?". LOL And he doesn't answer her right away.
Later after he got hit in the head (about an hour and 5 minutes into the film), and he is in his partner's car he tells her "I gotta get to my car, OK?...OK?" He's not telling her, he's asking her if she will let him.
I half expected him to say "please? Mommie, pleeaase?"
She answers him "you gotta get yourself together". Translation: grow up, you're supposed to be a detective.
And you know the reason he doesn't tell anyone what's going on is that he is too ashamed to admit he hired a contract killer through someone he had just met, someone he knew absolutely zilch about. And he gave this mystery person $15,000 without knowing the first thing about him. A real detective wouldn't be that stupid. This part is not Scott's fault though, its just a poorly written part of the story.