Why was juilius caeser assassinated

D - he ordered the Senate to make him dictator for life.
Julius Ceasar was assassinated on March 15 44 B.C. (the Ides of March) as a conspiracy when he wanted to rule Rome as a dictator for life.
The assassination of Julius Caesar, which occurred on this day in 44 B.C., known as the Ides of March, came about as a result of a conspiracy by as many 60 Roman senators. Led by Gaius Cassius Longinus and Marcus Junius Brutus, they fatally stabbed Caesar in Rome, near the Theatre of Pompey.