Cicely Tyson is reprising her role as Annalise Keating's (Viola Davis) well-intentioned but homicidal mother, Ophelia Harkness, when How To Get Away with Murder returns for the second half of its sixth and final season on April 2. Anne-Marie Johnson is also joining the drama as Michaela's (Aja Naomi King) high-profile defense attorney, Kenda Strauss, Deadline reports.