NEW YORK, June 15 (Reuters) - U.S. stocks had their biggest slide in a month on Monday after regional manufacturing data dented optimism about the economy's health and resource shares fell alongside commodity prices, pressured by a stronger U.S. dollar.
The Dow Jones industrial average dropped 187.13 points, or 2.13 percent, to close unofficially at 8,612.13. The Standard & Poor's 500 Index fell 22.49 points, or 2.38 percent, to end unofficially at 923.72. The Nasdaq Composite Index lost 42.42 points, or 2.28 percent, to finish unofficially at 1,816.38. (Reporting by Rodrigo Campos; Editing by Jan Paschal)