Movie in the 1970’s i cant remember

A man i drowned in a swimming pool by mafia using brooms to dunk his head under , his son witnesses the drowning
Years later the son takes revenge and goes after the mafia gang
I remember he was riding a motorbike and was chase scenes in the desert
The son was played by an actor with blonde hair??
Does this description ring a bell with anybody ?

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summertime killer

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