Mr Deroni said that the body has been flown to Nairobi.
"It was initially taken to Mpeketoni sub-county hospital mortuary but it has since been flown to Nairobi," he said.
Lamu County Commissioner Joseph Kanyiri, who confirmed that the body was found, praised Mr Deroni as a hero for dying in the line of duty.
"He went down defending his country," Mr Kanyiri said.
Three people were killed in the attack.
Mr Arid Kassim Athman, PS El Maawy's nephew, was also killed.