Molai, and several other sailors, were rafting on the river Saturday when they ran into trouble near Laton in Fresno County.
Officials say the group was caught off guard by an overflow dam. The Fresno County Sheriff's Office searched the water Saturday night and again Sunday morning.
So far there has been no sign of Molai and rescue crews say it is likely he is dead. The nine other people rafting with Molai were rescued from the river.
The part of the Kings River where the group was rafting was not the area that has been closed to recreational use.