Key Step: Arrest

Steps in a Trial: Arrest Procedures (American Bar Association)
FindLaw: Arrest
Wikipedia: Arrest
Knowing When An Arrest Is Legal Summary of when it is legal for police to make an arrest. (Nolo Press)
Your Rights If Arrested:

Missouri State Bar
Illinois Lawyer Finder

Arrest And Related Procedures Sections on arrest from Oregon law.

Police Crime Investigation Report

Case Notes: State Criminal Code

California Homicide Statutes The various sections on murder and manslaughter.
Missouri Homicide Statutes

Case Notes: In the Defense of Thomas Evans