Tin men : a crime novel / Mike Knowles.

Enhanced descriptions from Syndetics:

Three crooked cops going straight after a murderer Woody was working on getting high when the phone rang. Dennis was on a date -- it was a date he paid for, but a date all the same. Os had blood on his hands from a little extracurricular law enforcement. All three men picked up their phones because they were cops, and cops are never really off-duty -- not even when they're crooked. Detective Julie Owen was savagely killed in her own bed, and the unborn child she was carrying is nowhere to be found. The grisly crime has the brass breathing down the necks of the three detectives tasked with finding Julie's killer. Woody, Dennis, and Os each shared a bond with Julie that went deeper than the blue of their uniforms and have their own reasons to want to find the person responsible for her murder. Secrets drive the investigation -- secrets that need to stay buried long enough to solve the case.