The Ninth Circuit has determined that a California conviction for involuntary manslaughter does not qualify as a crime of violence because it includes reckless conduct. A crime of violence, as defined in 18 USC 16, requires intentional conduct.
The full text of United States v. Benally can be found here:
http://cdn.ca9.uscourts.gov/datastore/opinions/2016/08/01/14-10452.pdf