Chadwick Boseman will forever be missed. The Black Panther star sadly died on Aug. 28 after a years-long battle with colon cancer which was kept private from the public eye. Many of his co-stars and friends paid tribute on what would have been his 44th birthday, sharing sweet photos and memories of their time with Chadwick — including his Marvel co-stars Lupita Nyong’o, 37, and Mark Ruffalo, 53.