By Melissa Luck

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Wenatchee, Washington ( KXLY ) -- (WARNING): This story contains details about the way three children were murdered and will likely be disturbing for readers)

Three young girls who weren't returned to their mother after a visit with their dad were likely zip-tied, then killed by having plastic bags placed over their heads.

Those details are part of a probable cause document used to obtain a warrant for the arrest of their father Travis Decker.

Decker is wanted for three counts of first-degree murder and three counts of first-degree kidnapping for the deaths of 9-year-old Paityn, 8-year-old Evelyn and 5-year-old Olivia.

Decker was supposed to be visiting the girls for a few hours Friday night, but failed to bring them back to thei

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