<Tr> <Td_colspan="2"> <Ul> <Li> ◀ </Li> <Li> 2009 </Li> <Li> ▶ </Li> </Ul> </Td> </Tr> <Ul> <Li> ◀ </Li> <Li> 2009 </Li> <Li> ▶ </Li> </Ul> <P> The fourth season of America's Got Talent, an American television reality show talent competition, premiered on the NBC network on June 23, 2009 . Country singer Kevin Skinner was named the winner on September 16, 2009 . This season is the first season to be broadcast in high definition . </P> <P> This season's host is Nick Cannon, who replaced Jerry Springer . Springer had said that he could not host due to other commitments . David Hasselhoff, Piers Morgan and Sharon Osbourne returned judges, despite rumors that Osbourne would be leaving the show . </P>

Who won season 4 of america's got talent