Tyler Hadley, of Port St Lucie, Florida, allegedly beat his school teacher mother Mary-Jo and father Blake to death with a hammer, which was found lying between their bodies.
The teen is thought to have killed his parents before hosting a party for 40 to 60 people on Saturday night after posting invitations on Facebook.
The party started at around 9pm and went on until around 3am.
Police arrived at the ranch-style home the next day after an anonymous tip.
Hadley had been 'nervous and panicky,' they said and there were beer cans strewn all over the garden.
He initially told police his parents were out of town.
Police then found the bodies of Mr and Mrs Hadley in the master bedroom where the door had been locked.
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Their bodies were partially buried under various items including linen, books, picture frames and towels.
Mrs Hadley, 47, is believed to have been killed first and then Mr Hadley, 54, afterwards.
They were not, authorities believe, killed in the bedroom where their bodies were found
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