Emily Harris admitted to doing the shooting. All of those present, however, including Sara Jane Olson, would be subject a charge of first degree murder -- as they were participating in a felony during which a murder was committed.
In Texas, all four would be eligible for the needle. In California, they can probably get off scot-free -- if they just say they're "sorry"...
If they are tried in Sacramento, should get a real jury, instead of the usual LA show.