Two-year-old Marshall Klein vanished from Fairbanks, Alaska, on April 28, 1984, while last seen with his mother, Joyce Hefnerklein. Their disappearances are treated as suspected homicides connected to a series of killings in the Manley Hot Springs area in May 1984 involving Michael Silka. Investigators believe the bodies of Marshall and his mother may have been placed in the Tanana River near Manley Hot Springs; their remains have never been recovered.

Local residents, including the Klein family, disappeared on or about May 17; Silka was killed in a shootout with Alaska State Troopers on May 19. The full fate of Marshall Klein remains unresolved and his family never recovered his remains.

Anyone who knew the Klein family, their movements in late April and May 1984, or who has information about Manley Hot Springs that might shed light on this case is asked to come forward.