Following a three-week trial, a federal jury in Central Islip today returned a verdict convicting Christian Gerold Tarantino, a part-owner of Synergy Fitness Clubs located in Farmingdale, Levittown, Franklin Square, Massapequa and Long Beach, of conspiracy to commit the August 2003 obstruction-of-justice murder of Vincent Gargiulo, a former associate who threatened to reveal evidence of the defendant’s participation in two 1994 murders on Long Island. The jury found the defendant not guilty of aiding and abetting in the murder. The conviction was announced by Loretta E. Lynch, United States Attorney for the Eastern District of New York, and Janice K. Fedarcyk, Assistant Director-in-Charge, Federal Bureau of Investigation, New York Field Office.