Tyler Hadley, 17, wrote "Party at my crib tonight" and added the letters "hmu" which meant that friends should contact him, TCPalm.com reported.
Authorities said by the time the party started on July 16 Hadley had already beaten his parents Mary Jo and Blake Hadley to death, documents released by the Port St. Lucie state's attorney's office said.
Details about the party were among 250 pages of information and 937 crime scene pictures from the homicide investigation made available a week after a Fort Pierce grand jury indicted Tyler Hadley on two counts of first-degree homicide.
The information included details from the teen's Facebook page invitation that drew 60 people to the family home after his parents' deaths.
By law, evidence in criminal investigations becomes public when it is shared by prosecutors and defense attorneys.