In November, Chris Watts got three consecutive life sentences for the August slayings of his pregnant wife, Shanann Watts, and their daughters, Bella, 4, and Celeste, 3.

Over the summer, as Shanann Watts tried to save her marriage, Chris Watts went from a loving husband to a killer.

Combing through phone records, texts, photos, and police records, this is the full timeline of the Chris Watts murder case.

Editor's Note: Some readers may find details in this story disturbing.

On August 13, the faces of pregnant Shanann Watts and her two daughters, 4-year-old Bella and 3-year-old Celeste, were printed on missing-person posters after they suddenly disappeared from their home in Frederick, Colorado.

At first, Shanann Watts' husband, Chris Watts, agreed to TV interviews, in which he appeared torn up over their sudden disappearance and begged for their safe return.

Just two days later, he was arrested in connection with their deaths.

On social media, the couple seemed like they had a perfect marriage. But Chris Watts had secretly started seeing a coworker, telling her that he and his wife were in the process of separating.

While Shanann Watts spent most of the summer in North Carolina with relatives, he spent more and more time with his new girlfriend, and his wife noticed him growing distant. She desperately tried to salvage their relationship.

When she returned from a business trip the morning of August 13, she and Chris Watts got into a fight, which ended with 15-weeks-pregnant Shanann Watts being strangled to death and their two daughters smothered.

Despite Chris Watts' waning affections, nothing seems to explain what possessed him to kill his family.

This is the full timeline of the grisly case, culled from police records.