Fisher, best known to her fans as Princess Leia from 'Star Wars', died Tuesday at age 60 after going into cardiac arrest while on an airplane.
On Wednesday afternoon, her 84-year-old mother was rushed to the hospital after suffering a stroke. She died that night.
The specials will document the careers of the beloved icons, while also featuring tributes from friends and family, including Todd Fisher, who is Fisher's brother, reported Entertainment Weekly.
Beginning with 14 episodes of Reynolds' Emmy-nominated run on "Will & Grace" as Debra Messing's mother, the marathon will then feature her guest judge appearance on RuPaul, followed by the episode of "Roseanne", which was written by Fisher and guest-starred Reynolds.
Fisher's Emmy-nominated 2010 documentary based on her autographical play will get an encore airing with archival footage of the actress and interviews with friends and family.
HBO's "Bright Lights" starring Fisher and Reynolds will premiere on January 7, which was originally slated for a March premiere before being moved up, goes behind-the-scenes with the mother and daughter as they prepare for Reynolds to be honoured at the 2015 Screen Actors Guild Awards.
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