It's going to take 10 days to find out why Hollywood actor Heath Ledger died.
The 28-year-old Australian was found dead in his home in New York, America, on Tuesday.
He was a well-know star, starting off in soap Home and Away, and had just finished playing the Joker in the new Batman movie The Dark Knight.
It's thought Heath may have died of a drug overdose but more tests are needed to make certain. Police don't think anyone else was involved in his death.
His dad, Kim, said Heath had been a "down to earth, generous, kind hearted, life-loving, unselfish individual".
Flowers have been left in tribute
Heath's first role was as Scott Irwin in Home and Away back in 1997.
Since then he's starred in loads of Hollywood films, receiving rave reviews and, more recently, Oscar, Golden Globe and Bafta nominations.
Fans have been leaving flowers outside his flat and other stars have paid tribute to him.
Golden Compass actress Nicole Kidman described Heath's death as a "terrible tragedy".