Refers to a person being sought, typically by family, authorities, or in public notices. Often used in compound phrases like 尋ね人を探す.
The police released information about the missing person.
彼女は長年、尋ね人を探し続けている。
She has been searching for the missing person for many years.
He has been searching for a missing family member for years after they were separated.
There was a missing-person notice in the newspaper.
I heard the missing person was finally found.