Richardson was arrested the next day and remains in custody as her husband tries to pick up the pieces and move on with his life.
Nathaniel Richardson says there were no red flags that gave him clues about what his wife was allegedly up to, adding that if he had spotted something, he would've "blown the whistle a long time ago."
"I had theories, she wanted to get her face out there and destroy me. She wanted to be an actress. She really did," Richardson said.
Shannon Richardson has appeared on television, including a stint as a zombie on "The Walking Dead" and a role in "The Vampire Diaries."
"It still seems like a bad dream sometimes, that it really didn't happen," Nathaniel Richardson added.
Meanwhile, Nathaniel Richardson says there's nothing left in his marriage to love.
"The person she was wasn't real," he said. "Just couldn't believe it. Heartbreaking."
The Associated Press contributed to this report.