Christopher Watts entered his plea Tuesday during a court hearing in Greeley, replying "guilty" nine times in response to Judge Marcelo Kopcow's reading of each charge against him in the deaths of Shanann Watts, 34, and their children, Bella, 4, and Celeste, 3.
As the judge read each charge one by one, Watts pleaded "guilty", his voice sometimes cracking.
The agreement also required Watts to plead guilty to unlawful termination of Shanann Watts' pregnancy, a felony in Colorado.
Shanann's parents Frank and Sandra Rzucek are pictured at the press conference after his hearing on Tuesday.
Breaking - Chris Watts to take a plea deal to killing his pregnant wife and two daughters.
Watts, a former oil and gas worker, was charged in August with killing his pregnant wife and their daughters inside their home in Frederick, a community in the oil and gas fields north of Denver.
He buried his wife in a shallow grave and stuffed his dead daughters in oil tanks where he worked.
Christopher Watts initially claimed to police after he was arrested that he killed Shanann Watts after she killed their daughters, according to court documents.
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Christopher Watts, 33, said he had killed Shannann Watts after seeing her strangling one of their children on a baby monitor.
Rourke said at a press conference that the plea deal was made with the support of Shanann Watts' family, and after he explained what he called the "extraordinary delays that now exist" in Colorado in putting prisoners to death.
"We charged him with what we truly believed he had done", Rourke said.
"I just want them back", he said in the interview. "I don't want to be in the position to make that choice to take his, '" Rourke said.
"He deserves a life sentence for each and every act", Weld County District Attorney Michael Rourke said.
"I was not willing to entertain any further concessions above and beyond removing the death penalty", he said. "I know that that will never be fully realized because, obviously, the tragedy that sits before us today is the loss of four handsome lives (including Shanann's unborn baby)".
When asked how he feels, Rourke said "sick" and "saddened".
Shanann had returned home from a business trip when she was killed. "The spotlight shines directly where it belongs: On him". I never wanted to have to stand up and have a press conference like this.