Actor Jake Gyllenhaal will join his sister MAGGIE at one of THE DARK KNIGHT premieres in a bid to pay tribute to his BROKEBACK MOUNTAIN co-star and friend Heath Ledger.

Jake Gyllenhaal, the godfather of Ledger's two-year-old daughter with Michelle Williams, is planning to attend one of the upcoming U.S. premieres.

He'll support his sister Maggie, who worked with tragic Ledger on the new Batman film.

A source tells OK! magazine, "Jake is debating coming to the New York city premiere or waiting to be Maggie's date at an L.A. (Los Angeles) screening.

"He wants this to be something positive that will celebrate the role of a lifetime and a performance of which Heath was so proud."

Ledger's parents and sister are also expected to jet to New York from their home in Perth, Australia, to attend the New York premiere on 14 July (08).

Ledger was found dead in his New York apartment in January (08).