BET announced the departure of two of its top executives last week: its longtime president Stephen Hill and head of original programming Zola Mashariki. Sources say, Mashariki was caught off guard by public statements issued by the network and its CEO Debra Lee, which indicated she was out too. Mashariki sent her colleagues an email this week, notifying them that she’s been on medical leave since February after being diagnosed with breast cancer and that she planned on returning to her job.