A Secret Service officer was arrested and placed on leave after allegedly exposing himself and masturbating in front of guests at a Miami hotel. John Spillman, 33, “committed the offense of indecent exposure” at a DoubleTree by Hilton Hotel Miami Airport & Convention Center late Sunday night, according to an arrest report obtained by WSVN. Hotel visitors told investigators they were in the lobby, and Spillman started following them, making guests retreat to their rooms for safety. One guest told authorities she and others were in “fear for their lives,” according to the report. The guests then “saw the defendant masturbating next to their hotel room,” prompting them to call hotel security. Spillman was found “with his pants lowered and masturbating on the sixth floor,” the arrest report says.…