But she wasn't prepared for the amount of time she'd be required to spend with a man who viewed people as objects - with no more value than a piece of paper or a discarded penny.
"He needed to talk, so I'm the one he talked to," McKinnon said.
For five to six hours every day, McKinnon was a handler, counselor, confidante and companion. It was her job to keep Rader occupied, to listen to his concerns for his family and to keep him from receiving the media attention he so desperately craved.
"I spent the most time with him, by far," McKinnon said. "For the first couple of months, I spent nearly every day with him."
McKinnon said her time with Rader would've been easier if he had been the sort of hideously disfigured monster that matched the piles of evidence she read at the office.
Instead, she sat just inches away and talked daily with a Boy Scout leader, a church president, a family man and a community-minded citizen who repeatedly told investigators that when he wasn't murdering people, he was really a likable person.
"He wasn't what I expected," McKinnon recalled. "The person I met was human, not the image that was on the media. He was courteous, polite, considerate and easy to deal with."
But McKinnon had difficulty reconciling the two sides of Rader that she was forced to mold into one person.
"Mentally, it was challenging to have those two things co-exist," McKinnon said. "It would've been easier emotionally to process the things he had done if he wasn't the human being I saw."
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