Jonathan Tisdale is a character portrayed by Keir Dullea in the ABC crime series Castle. Mr. Tisdale was a self-made millionaire industrialist from New York. In 2009, he was terminally ill from cancer, having recently taken to wearing a wig and having suffered a notable loss of weight. He had to endure even more tragedy when his son, Harrison, killed his daughter, Allison, to punish him for favoring her.