Family killer Chris Watts hid nude selfies and explicit vids of his mistress in calculator app on his phone, cops found

 prison for the savage murder of his wife Shanann and , Bella, four, and Celeste, three, on August 13, 2018, in 

Detective Michael Prill, of the Greeley PD in Colorado, analysed Watts's phone as part of 2,000 pages of police evidence compiled in the case.

Detective Prill said: “lt became apparent he was receiving assorted nude images of Kessinger that she was taking by herself and sending to Watts, which he then stashed in that application to prevent Shanann from ever seeing them.”

And in text messages sent days before he murdered his wife and kids, Watts discussed his martial problems with Shanann – and claimed his daughters were the “light of my life”.

He wrote: "These kids mean the world to me and always will. These kiddos are the light of my life and seeing their sweet, incredible smiles and playfulness makes me smile every day.”

And trying to console Shanann over a row with his mother, Watts sent her quote from US religious leader Isaac Kubvoruno.

It read: "Husbands: stand up for your wife and protect her from the attacks that come from the people close to you. Let your family and friends know that when it comes to your wife and marriage, there is a line they cannot cross.

“lf you have to take sides then always take your wife's side. From the day you said 'l do' your wife displaces your parents, friends and siblings. Apart from God, your wife now occupies and assumes the privileged first place of honour in your life.

“Oftentimes it requires that you lovingly stand up for your wife in front of your parents, especially our mother. Therefore, what God has jioined together, let no (mother, father, brother, sister, friend or boss) separate."

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At the same time, cops found that Kessinger was looking up Shanann’s social media pages and researching wedding dresses online.

Cops in Denver also found that following the murders, Watts sat down at his computer and googled the lyrics to the song Battery by rock band Metallica.

One of the lines reads: “Smashing through the boundaries, lunacy has found me, cannot stop the battery.

"Pounding out aggression, turns into obsession, cannot kill the battery, cannot kill the family, battery is found in me.”

Oil worker Watts pleaded guilty to killing pregnant Shanann, 34, and their two daughters after striking a deal with prosecutors to avoid the death sentence.

The horrific murders are the subject of the Netflix documentary American Murder: The Family Next Door, shocking viewers.

The wife killer the  in one of  – and he also revealed that he'd been thinking about killing her for "weeks."

"Her eyes filled with blood; as she looked at me and she died. I knew she was gone when she relieved herself,"  recalled in a bombshell letter to author Cheryln Cadle, which was obtained by the .

Watts – who had been having an affair with his co-worker  – indicated in these letters to Cadle that he thought about killing his family in the days leading up to their deaths.