A team of private-sector outdoorsmen and another of Yellowstone National Park personnel and volunteers are preparing missions ...

Henke, the father of a Minnesota native who went missing in Yellowstone last fall, announced on July 6 that the search for his son, Austin King, will resume later this month.

Jaime King is engaged to investor Austin Sosa, and "is very close with his family," a source exclusively tells PEOPLE.

"All I want to be able to do is say as a dad, I did everything I could to give the best chance of finding him," wrote Brian King-Henke, vowing to bring Austin home.