Mary Hannig was 39 when she was killed in Marple Township, Pennsylvania; her death occurred on January 17, 1972 and has been classified as a homicide.

Decades have passed with few public details released, leaving significant gaps about the investigation and what leads, if any, were pursued.

Does anyone with memories of Marple Township in 1972, or family knowledge about Mary Hannig, have information that could shed light on this long-unsolved homicide?