What you said.
Just deport him.
I believe he has been deported five times previously. Obviously that is only a minor inconvenience for him. It is a crime to return following deportation which has a penalty of, I believe, up to five years in federal prison with no parole. That is more severe than he would have faced for a manslauter conviction at the state level. If he were to be charged for each illegal re-entry, he could be facing up to twenty five years. No double jeopardy question involved. In addition, he would not be tried in San Francisco, but in the jurisdiction where he committed the illegal entry.