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If he does indeed have Diplomatic Immunity, he would have to be declared Persona Non Grata by the US government and given an opportunity to leave the country.

If he refuses to leave, he is then fair game as his Diplomatic Immunity would be gone.

"Ceterum censeo 0bama esse delendam."

Garde la Foi, mes amis! Nous nous sommes les sauveurs de la République! Maintenant et Toujours!
(Keep the Faith, my friends! We are the saviors of the Republic! Now and Forever!)
LonePalm, le Républicain du verre cassé (The Broken Glass Republican)

“Diplomatic immunity can quite easily be revoked....”

Well, the country from which the offender has legitimate diplomatic immunity must waive that immunity for prosecution here to proceed. Unfortunately, that rarely happens, especially with senior-level officials and their families. What typically happens in the case of serious charges (like vehicular homicide or manslaughter) is that the offender is expelled. There was a famous case in the DC suburbs a number of years ago where a diplomat was involved in a series of auto accidents, culminating in a crash in which someone was killed. He was finally expelled from the US, not prosecuted here, because his home country would not waive immunity.