After a bit of speculation and uncertainty, Michael Clarke Duncan is finally in negotiations to voice the character of Kilowog in Green Lantern. The film features a number of CG characters and just last month Geoffrey Rush signed on to voice Tomar-Re. Heat Vision reports that Duncan received the offer just this week, and is now in negotiations to take on the role. Impressively, Rush only started doing voice work two weeks ago, but his character (and dialogue) was featured in the footage shown at Wonder-Con last weekend.Directed by Martin Campbell, Green Lantern stars Ryan Reynolds, Blake Lively, Peter Sarsgaard, Mark Strong, Jay O. Sanders, Temuera Morrison, Taika Waititi, Jon Tenney, Angela Bassett, and Tim Robbins. The film is set to hit theaters June 17^th.