Robin Roberts will return to 'Good Morning America' on Feb. 20 [VIDEO]

ABC announced today that "Good Morning America" co-anchor Robin Roberts -- who has been on medical leave since September -- will return to "GMA" on Wednesday, Feb. 20. Roberts announced on the show last summer that she had been diagnosed with myelodysplastic syndrome (MDS) -- a blood disorder that affects bone marrow, likely caused by her treatment for breast cancer five years ago. She went through chemotherapy and a bone marrow transplant.