Gyllenhaal changes attitude to acting

Hollywood actor Jake Gyllenhaal has never worked harder in his life since starring in upcoming David Fincher movie Zodiac.

The Oscar-nominated star, 25, plays real-life author Robert Graysmith in the real-life story of the police hunt for the zodiac serial killer who terrorised the San Francisco Bay area of California in the 1960s and 1970s. To this day, the murderer has never been caught.