Macro called Caligula "Princeps" and said Tiberius' pillow was the easiest thing to kill him with. Macro said "Hail, Caesar!" and Caligula took the throne the next day. But soon Caligula began to distrust Macro, the emperor ordered his arrest and Macro committed suicide before he could be executed.

Did Caligula have macro killed?

Macro murdered Tiberius and helped Caligula in taking power, but he served as Caligula's scapegoat and was consequently executed in a gruesome public show.

Who did Caligula kill?

In 41 AD, four months after he returned from Gaul, he was murdered by his closest advisors, including members of his Praetorian Guard. To prevent reprisals, they also killed his wife and daughter. Dead but certainly not mourned, Caligula was succeeded by his uncle, Claudius, the most unlikely of emperors.