A prominent Florida real estate developer was found dead by suicide when FBI agents raided his $4.2 million waterfront home Tuesday morning to arrest him in a murder-for-hire probe involving his estranged wife, according to reports. Sergio Pino, 67, died “from an apparent self-inflicted gunshot wound,” the FBI said, according to Miami TV station WPLG. A SWAT team entered Pino’s house in Coral Gables’ swank Cocoplum neighborhood after calling out to anyone inside and getting no response, according to the Miami Herald, which cited the FBI. Agents reportedly found Pino’s body in an upstairs bedro…