US STOCKS-Wall St falls as Alcoa's results disappoint
* Alcoa marks biggest percentage fall since 2011
* St. Jude falls after warning on battery flaw in heart device
* Apple at 10-month high after Samsung scraps Galaxy Note 7
* Indexes down: Dow 0.82 pct, S&P 0.91 pct, Nasdaq 1.01 pct (Adds details, comments, updates prices)
By Yashaswini Swamynathan
Oct 11 (Reuters) - U.S. stocks fell on Tuesday amid broad declines across sectors after Alcoa kicked off the earnings season on a disappointing note.
Alcoa's shares fell nearly 11 percent, their worst day in five years after the aluminum producer reported quarterly revenue and profit that fell short of the market's expectation.
All the top S&P 500 indexes were lower, with healthcare stocks falling the most. Diagnostic test maker Illumina lost more than a quarter of its value after it cut its third-quarter revenue forecast for the second time in a row.
Overall earnings of the S&P 500 companies are expected to fall 0.7 percent in the third quarter, the fifth straight quarter of decline, according to Thomson Reuters data. Continuación...