Martin Short made his first red carpet appearance three months after his daughter Katherine’s tragic death. The comedian attended the Los Angeles special screening of his new Netflix documentary film, “Marty, Life Is Short,” on Wednesday at the Egyptian Theatre. Martin, 76, was joined by his sons, Oliver, 40, and Henry, 36, and other loved ones as they took family photos on the red carpet. Martin Short was joined by his family, including his sons Henry and Oliver, at the premiere of his Netflix documentary “Marty, Life Is Short” on Wednesday in Los Angeles. Xavier Collin/Image Press Agency / BACKGRID The event marked Martin’s first red carpet appearance since his daughter Katherine’s death in February (Martin is pictured above with his family at the premiere). Getty Images for Netflix The comedian (seen above with his family) wore a black suit with a checkered tie to the premiere.…