Apolinario was earlier diagnosed with lymphoma, a type of cancer that is linked to the immune system. He was reportedly in critical condition since Wednesday.
The former Kapuso is now the showrunner of the morning edition of Newsroom, anchored by Ria Tanjuatco-Trillo.
Santos' vlog series will be called 'Your Morning Girl, Rhea.'
Santos will be migrating to Canada with her family next month, where she will be pursuing an advanced study, said to be in digital journalism.
Beginning June 4, the Kapuso news channel will start simulcasting DZBB's radio programs up until 12NN from its new channel, UHF Channel 27.