Natalie Wood Investigators -- We Ain't Found Squat!!!

The re-opened investigation into Natalie Wood's death turned up goose eggs ... as in nada, zilch, zero, zip ... this according to cops.

The L.A. County Sheriff's Department says investigators have found nothing to lead them to believe Natalie's mysterious death in 1981 was anything but an accident.

As TMZ previously reported, investigators reopened the case after 30 years due to information from a book written by the the captain of the boat where Natalie spent her last minutes.

The case isn't closed ... yet. Cops say they're still on the hunt for evidence ... but so far ... they got nuthin'.