If the Mexican president is unable to perform his/her duties, the Secretary of the Interior would act as interim president until new elections are held.
If the president dies or resigns, the vice president takes over his job for the remaining years/job.
The speaker of the house will be the acting president.
Vice President takes over
In this case, the lame duck vice-president would become president.
The President appoints a new Vice President, who must be approved by Congress.
The vice president will become the president if that happens. Well, what happened when Lincoln was killed?
If the Italian leader dies,the government votes to choose another one.
The vice president gets sworn in. Just look up what happened to president Kennedy.
"If the President is convicted in an impeachment trial" (or dies), "the President is the only person who loses his office. The Vice President would become the President upon the conviction." -US Constitution
Kobe Bryant will be in the hall of fame and be the president when he retires haha
The speaker of the house takes over(:
Next would be the Vice-President, and then the Speaker of the House if something where to happen to the Vice President.