Travis Decker – now missing in Washington state's wilderness after allegedly murdering his three daughters – had a history of escalating violence, according to his brother who revealed Travis' 'violent' reaction when his family attempted to hold an intervention.

Thomas, 35, told the Daily Mail exclusively that his brother's actions are unrecognizable from when they were children and begged him to 'stop this evil' and turn himself in after the bodies of his children Paityn, 9, Evelyn, 8, and Olivia, 5, were found near Rock Island Campground.

Authorities started the search for the three little girls after they failed to return home from a scheduled visit with their father on May 30.

Three days later, they were found suffocated, with plastic bags over their heads and bound with zip ties, the Chelan County Sheriff's Office confirmed.

Shortly after, a no-bail arrest warrant was issued for Travis, 32, on three counts of first-degree murder and three counts of kidnapping.