MIAMI (Reuters) - A Florida diver shot a large grouper with a spear gun then apparently drowned when the fish sped into a hole, entangling the man in the line attached to the spear, investigators said on Monday. The 42-year-old man, whose name was withheld, was free-diving in about 25 feet (7.5 metres) of water off the lower Florida Keys on Saturday and speared a Goliath Grouper, Monroe County Sheriff's Detective Mark Coleman said. "It looks like the fish wrapped the line attached to the spear around the victim's wrist. The fish then went into a hole in a coral...