Pretty Little Liars: 6 Juicy Hints About the Finale, Straight From Huw Collins

"It wasn't explicit that he was going to be a bad character going into it. It was initially told to me that he was a good guy . . . and then, as time went on, the subtexts of the scripts . . . I think around that time Marlene let me in on the fact that Rollins is not 'holier than thou;' he's actually a Machiavellian psychopath who has decided to dupe his wife into believing she's crazy so that he can further his own ends."