Heath Ledger was a member of the Advisory Board of Develop Don’t Destroy Brooklyn. Not only was he a brilliant actor but his heart was in the right place when it came to development issues in Brooklyn. DDDB has nice condolence note up on their website:

  We offer our condolences to all of Heath Ledger’s loved ones. Our heart goes
  out to his young daughter. His passing is very sad news.
 

Heath was a member of our Advisory Board.
He was not afraid to speak out against the entrenched power and corporate back
room deals that the Atlantic Yards represents. He felt passionately that this
project was wrong for Brooklyn. DDDB thanks him and celebrates his life.
 

We are grateful that Heath chose to contribute to our efforts, and hope to honor
his memory through our ongoing work.