nà / míng / shī / zōng / zhě / duō / nián / yǎo / wú / yīn / xìn / zhì / jīn / bù / zhī / suǒ / zhōng

那名失踪者多年杳无音信，至今不知所终。

The missing person has been unheard from for years, and their whereabouts remain unknown.