Wenatchee Police Department

Three young sisters who went missing while visiting their father were found murdered in Washington state -- and now we know how they were apparently killed, as police search for their dad.

Paityn Decker , 9, Evelyn Decker , 8, and Olivia Decker , 5, likely died by asphyxiation, according to court documents obtained by Fox 13 Seattle . Wenatchee Police Department

Police say the bodies of the sisters were discovered Monday after detectives traced the whereabouts of their father's GMC Sierra pickup truck to an area near some campgrounds in Chelan County, WA.

Cops say the girl's father, Travis Decker , has vanished and investigators have now launched a massive manhunt to find him. Wenatchee Police Department

What's more, Decker has been charged

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