It varies some. Usually, the SOL is 7 1/2 years. But, if you have a Warrant...there is no statute. They can look for you until they Find you.
EDIT: @ Bruce: It IS 7 1/2 years for Some felonies. Why would my Lawyer Lie? I saw it in the ARS books. Besides, read your Own link--it is as high as 6 years in CA.......None for Murder. Who Knows what the IL laws are, when Obama had been a senator?...
Say, if you actually "did" the crime in IL and you fled to CA, if they didn't find a suspect within the staturtes,it is OK for you. If you had/have a warrant in IL, and then fled to CA to avoid prosecution...that is a Fed. violation.
Murder has no SOL.