WHO KILLED CELIA ELIZABETH VAN ZANTEN?

According to https://lelandhale.com/butcherbaker/wordpress/2018/07/31/beth-van-zanten-disappearance/ and https://it.findagrave.com/memorial/119381709/celia-beth-van_zanten#view- photo=251455458 , Celia Elizabeth Van Zanten vanished into thin air on December 22, 1971 while she was traveling a “Z” route from her residence at 2900 Knik Avenue to the Bi-Lo store located at 2511 W Northern Lights, also in Anchorage, Alaska, to then go babysitting at another unspecified home.