When Shanann Watts blew out the candles on her birthday cake on January 10, 2018, with her two young daughters by her side, she had no idea it would be her last birthday — or that all three of them would be dead in the coming year.
In a video posted online of her 34th birthday celebration, Shanann’s little girls, Bella, 4, and Celeste, 3, sang a sweet rendition of Happy Birthday to their mom as Shanann’s own mother, Sandra Rzucek, joins in via Facetime on Shanann’s phone.
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Last summer, Shanann and her daughters spent six weeks in North Carolina with her parents and brother before returning to the Frederick, Colorado, home she shared with Chris on Aug. 7. She left home again to attend a quick work trip on Aug. 10, returning home just before 2 a.m. on Aug. 13. Hours later, Chris killed her and the girls.
Authorities still do not know exactly what led Chris — who was having an affair with a co-worker — to kill his whole family that fateful morning, after which he went on TV news to plead for her safe return.
“If he was this happy and wanted a new start, get a divorce,” Weld County Prosecutor Michael Rourke said.
“That’s the big word — why?” Shanann’s father, Frank Rzucek told 20/20. “He must have snapped because there’s nothing else I could figure out what happened to him.”
On Nov. 6, Chris pleaded guilty to murder, the unlawful termination of a pregnancy and tampering with a dead body in exchange for an agreement that prosecutors would not pursue the death penalty, the Weld County district attorney’s office said.
Thirteen days later, he was sentenced to five life sentences, three to be served consecutively, without the possibility of parole.
In December, he was tranferred to an out-of-state prison “for his own safety,” a source close to Watts tells PEOPLE.