The Hillsborough County Sheriff's Office would not elaborate on that finding Tuesday.
Abraham Shakespeare's body was found last week, buried behind a home in eastern Hillsborough County. Officials said a concrete slab had been poured atop his grave.
No arrests have been made in the case.
Shakespeare, of Lakeland, won $30 million in the Florida Lottery in 2006. He was last seen in April 2009, and officials have long thought his death was a homicide.
