easy one ! :) Acrisius' grandson was sent out to kill him unless he killed his daughter. But the gods would punish you if you killed family.
To go kill him self under a rock or a cave
King Acrisius died when his grandson Perseus accidentally hit him with a discus.
In the end, Acrisius dies at the hands of his grandson Perseus during a discus-throwing competition. This fulfills the prophecy that his daughter Danaë's son would kill him, as he tried to prevent Perseus from becoming the king of Argos.
Because an oracle told him his grandson would one day kill him and take his throne
When Acrisius consulted the Pythia regarding his chances for having a son, he was told that he would never have a son of his own, but rather, his daughter would. Further, that grandson would eventually kill him. This is why he locked Danae in the tower away from men, to prevent her from having that child. That son would be Perseus, who did indeed kill Acrisius after slaying Medusa.
Acrisius was killed in Larissa, by Perseus. As it was foretold by an oracle that Acrisius's daughter Danae, would have a child that would one day kill him - who turned out to be Perseus
King Acrisius received a prophecy from the Oracle of Delphi, which foretold that his daughter, Danaë, would bear a son who would eventually kill him. In fear of this prophecy, Acrisius locked Danaë away in a bronze chamber to prevent her from having children. Despite his efforts, Zeus visited her in the form of golden rain, resulting in the birth of Perseus, who later fulfilled the prophecy.
Her name was Danae, daughter of King Acrisius of Argos. The oracle had told Acrisius that his grandson would kill him, so he imprisoned Danae in an underground chamber without a roof. Zeus came to her as a shower of liquid gold, and impregnated her. Years later, her son Perseus was playing at discus when the wind caused his discus to veer, striking Acrisius in the head and killing him.
King Acrisius of Argos received a dire prophecy from the Oracle of Delphi, stating that he would be killed by his grandson. To prevent this fate, Acrisius imprisoned his daughter, Danaë, to prevent her from bearing children. However, Zeus visited her in the form of golden rain, resulting in the birth of Perseus, ultimately fulfilling the oracle's prophecy.
Zeus helped Danae by transforming into a golden shower and visiting her while she was imprisoned in a bronze chamber by her father, King Acrisius. This was done to fulfill a prophecy that Acrisius would be killed by his grandson. As a result of this union, Danae became pregnant and eventually gave birth to Perseus, who would later fulfill the prophecy by inadvertently killing Acrisius.
King Acrisius locked Danae in a tower because the Oracole of Apollo told him a son of Danae would kill him, so therefor he did not want her to have any children