When Colman Domingo gets cast as a historic figure, like his role as Joe Jackson in "Michael," he spends about 40 hours per week doing research to prepare. That includes watching videos, learning about the era his subject lived in and uncovering anything else he can find out. Domingo also confirmed that he's writing, producing and starring in "Unforgettable," a biopic about singer Nat King Cole. For now, he's leaning everything he can about the famous singer, but Domingo said his process is also about finding his own way to interpret Cole. Although his character is different from many of his dramatic roles, Domingo said the decision to join the show was a pretty easy one.