Highland Park shooting killer Robert Crimo got help from his father to get a gun.

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In 2020, his father sponsored his then 19-year-old son to get a gun owner ID card according to TMZ reports.

This card is necessary to then want to buy a semi-automatic rifle.

However, in 2019, Robert Crimo had threatened to kill his family.

His parents then decided not to press charges against their son, a decision that could have prevented the authorities from selling him a weapon.