They traced Kent Easter's call to the business center of a hotel in Newport Beach, Calif., and he had been recorded by the hotel's video surveillance system making the call, police said. Police also said Kent and his wife, Jill, were allegedly in constant contact via cell phone calls and text messages while Kent drove to and from the volunteer's home.
"They were in it together," Engen said.
The Easters both face felony charges and a maximum sentence of three years in state prison for conspiring to falsely report a crime and procure a false arrest, and for the volunteer's false imprisonment, police said. They posted $20,000 bail and are scheduled to be arraigned on July 17.
"How two people with so much going for them find themselves in this position is hard to understand," Engen said.
The Easters did not respond to ABCNews.com's repeated requests for comment.
The Easters' babysitter, Tiffany Pan, says she's shocked by the arrest of her employers, according to KABC-TV in Los Angeles. "They're always so positive and happy, and I just can't imagine them even doing anything like this," Pan said.