For anyone that's interested, here's a link to the current cold cases in regards to missing persons and unsolved murders the occurred on NPS land. If anyone has any new leads or new information, there's a toll-free number one can call in to relay the new information.
The list includes three persons that went missing in Yosemite:
https://www.nps.gov/orgs/1563/cold-cases.htm
Leave No Trace