A statement by Nassau County Sheriff Michael Sposato says 29-year-old Herve Jeannot died Tuesday night at the jail in East Meadow. He did not elaborate on the circumstances, citing an ongoing police investigation.
Jeannot was convicted Tuesday of murder and weapons charges in the death of Bobby Calabrese. Prosecutors say Jeannot was paid $4,000 by a co-worker to kill Calabrese, who worked as a bookmaker's runner.
It was the fourth trial for Jeannot on the charges. His first two trials ended in hung juries and a 2006 conviction was overturned on a technicality.
His attorney did not immediately return a telephone call for comment.