An actor that has won lead and supporting Oscars in the same year?

There is no actor who has won both a Lead and Supporting Oscar in the same year. It is impossible to win both categories in a single year, as the awards are given for different types of roles in a film.

Here's why:

* Lead Actor/Actress: Awarded to the best performance by an actor or actress playing a main character in a film.

* Supporting Actor/Actress: Awarded to the best performance by an actor or actress playing a secondary character in a film.

Therefore, an actor can only be nominated and win in one of these categories per year.