Who was the actor who played police lieutenat Al Pacino shot in restaurant movie Godfather?

There seems to be some confusion in your question.

* Al Pacino plays the role of Michael Corleone, the son of Don Vito Corleone, in The Godfather trilogy.

* Michael Corleone is not a police lieutenant.

* There is no scene in the Godfather films where a police lieutenant is shot in a restaurant.

Perhaps you are thinking of a different movie? Could you please provide more details about the film you're asking about?