Jake Gyllenhaal carried a pichure of Heath Ledger in his pocket

1 February 2008 - Jake Gyllenhaal can't believe he will never see Heath Ledger again.

'The Brokeback Mountain' star is still struggling to cope after Heath Ledger's unexpected death.

Jake Gyllenhaal is the godfather to Heath's daughter with Michelle Williams.

A source told People.com that Jake is struggling and that the atmosphere on the set of his latest movie has changed completely.

The source told of the time before Heath died, when everyone was laughing. During an early scene in the shooting of 'Brothers' everyone was tense because it was a prison scene.

According to the source Jake took out a picture of Heath from his pocket and pinned it up on the wall: "Like those prisoners put (loved ones) on the wall, but Jake's was Heath Ledger...That was hilarious. It was a nice moment."

This all happened before the tragic news of Heath's death broke.

The People.com source added: "When you think back on it now, it's touching."