The bodies were found several days later and Watts confessed to the killings. He pleaded guilty to avoid a possible death penalty sentence.
Watts's plea deal was entered on Nov. 6 and he was sentenced to life in prison without the possibility or parole on Nov. 19.
Watts is now in a prison outside of Colorado, the Department of Corrections confirmed, but it's not clear what state he's being held in.
Family members of Shanann Watts and the Weld County District Attorney's Office have been notified of the move.
“It was for his own safety,” the source said. “He’s too well-known in Colorado.”

Texts, Google Searches Revealed
The prison transfer came after records of texts and phone conversations between Chris and Shanann Watts, and Chris Watts and his mistress Nichol Kessinger were revealed.“While Shanann texted the defendant over and over again in the days and weeks leading up to her death, attempting to save her marriage, the defendant secreted pictures of his girlfriend into his phone, and searched, and texted her at all hours of the night,” Weld County District Attorney Michael Rourke said during the sentencing.
Records released by the office showed Shanann's optimism that the couple had turned a corner just days before her husband murdered her and their children.


The records included online searches conducted by Kessinger, who was regularly sending Chris Watts photographs.
Kessinger has said that Watts lied to her and said he was divorced and that she only found out that he was still married from news reports after Shanann Watts disappeared.