Give a stream of consciousness and then the final answer. Set in the Northwestern United States in 1875, the film focuses on taciturn widower Matt Calder (Robert Mitchum), who has recently been released from prison after serving time for killing one man while defending another. He arrives in a boomtown tent city in search of his ten-year-old son Mark (Tommy Rettig), who was left in the care of dance hall singer Kay (Marilyn Monroe) after the man who brought him there as Matt had arranged took off for the hills. Matt promises Mark, a virtual stranger to him, the two will enjoy a life of hunting, fishing and farming on their homestead.

Answer this question: who played the boy in river of no return?
The relevant information is: He arrives in a boomtown tent city in search of his ten-year-old son Mark (Tommy Rettig), who was left in the care of dance hall singer Kay (Marilyn Monroe) after the man who brought him there as Matt had arranged took off for the hills.
So, the final answer is Tommy Rettig.