A Better Way to Die (2000) on Netflix

Plot summary

Boomer is a rookie cop working the streets of downtown Chicago. When a drug bust goes wrong and Carlos, the mentor he looks up to like a father, is killed, Boomer loses his taste for the job. He turns in his resignation, leaves the Chicago Police Department behind and heads for Joliet, his hometown, where his fiancé Kelly is waiting. On the road he comes across a motorist whose car appears to have broken down and stops to help. The man attacks him instead and leaves him unconscious. Boomer comes to and finds his car and wallet gone, and himself caught up in a dangerous game of mistaken identity.