WHO KILLED KATHERINE RUBIN?

According to https://www.nytimes.com/1971/09/19/archives/woman-slain-in-village.html , Katherine Rubin was killed on September 18, 1971 in her apartment at 56 Jane Street in Greenwich Village in New York. The victim was found gagged, lying on the bed with her hands behind her back. The neighborhood is closely linked to the culture of the Beat Generation and hippies and