Robin Roberts' Mother Dies

8/31/2012 5:55 AM PDT

Lucimarian Tolliver Roberts Dead -- Robin Roberts' Mother Dies

Breaking News

It's almost too much for anyone to bear ... Now we know why "Good Morning America" anchor Robin Roberts left a day before her scheduled medical leave -- her mother died Thursday.

Roberts -- who will be taking several months off to undergo treatment -- including a bone marrow transplant -- for a rare blood disorder -- flew to Mississippi Thursday to see her 88-year-old mother, Lucimarian Tolliver Roberts, before she passed away.

Roberts -- who battled breast cancer and developed the blood disorder as a result of chemo -- will be getting the life-saving bone marrow from her sister, Sally-Ann. The procedure is scheduled for next week.