Since our separation, it has become increasingly clear that Travis has been struggling to maintain stability in his life,” Whitney Decker wrote.

Three young sisters were found dead in Washington state in early June, and authorities are searching for their father, Travis Decker.

The manhunt continues for Travis Caleb Decker, a former U.S. Army soldier accused of killing his three young daughters, as more than 100 officers from local, state and federal agencies patrol forests and campgrounds near the Pacific Crest Trail in Washington state.

Paityn, Evelyn, and Olivia Decker were found suffocated after court-approved visitation; their father, Travis Decker, is now charged with murder and kidnapping.

Just hours after the news broke Tuesday, hundreds gathered at Memorial Park in Wenatchee to hold a vigil for 9-year-old Paityn, 8-year-old Evelyn, and 5-year-old Olivia Decker. Since then, a memorial of flowers and photos has grown as residents gather to mourn and remember the three young girls.