This case intrigues me. It seems the police or investigators just dropped the ball. I found this information on another site:
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When police officers recontacted Kathy's family in April 1975, the family said they had no new information. However, when police spoke with them again in May, family members said they received a Western Union telegram from New Jersey, although they did not detail its contents.
Kathy's friend, with whom she had left her children, told police she, too, had received a telegram from Kathy, but that she had thrown it away.
Cipollini said until that time, police thought Kathy Jones was a routine missing person case. "But when we found out months later that an alleged telegram arrived shortly after her disappearance, the case was no longer 'routine.'"
Police also talked with an acquaintance of Kathy's during the investigation. The woman told law enforcement officers that Kathy came to her home Sept. 27, but never mentioned leaving town. The woman noted that Kathy did appear happy that day. She said a man with dark hair and a Mustache driving a red Volkswagen pulled up to her house. Kathy put clothes from her car into his and the two drove away.
Sgt. Cipollini said officers interviewed numerous friends of Kathy's, including a former boy-friend. "We even used dogs from New York state to search for Kathy's body," the sergeant said. Those investigative methods turned up nothing.
The investigation intensified in August 1976 when previously interviewed acquaintance made a startling admission. She told police she had sent the two telegrams... one to Kathy's family, the other to Kathy's friend in charge of the children.
She said she had sent the telegrams because, "Kathy had asked me to," saying she would explain the reasons later.
"Things just don't add up," Cipollini said. "That's why I rally think she was murdered." Going one step further, Cipollini said he will now try for a grand jury investigation into Katherine Jones case.
Taken from: DuBois Courier Express 4/28/1989
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I don't understand why the police did not get more information from the woman that claims she sent the telegrams!!! Why would they drop the ball? Where did that woman see her? Did she call the woman or tell her in person? Did that woman know about the man in the red VW? Why did her family seem so disinterested? They got wires but threw them out? They never called police about them? Why? What happened to her car??? It says she was at the friends and took her clothing out of the car and put it in this boyfriends car. So what happened to her car? why was it left at the friends? Was it left there? So many unanswered questions. How about the woman that said she sent a telegram but would tell them later why she did. Did she ever tell them? If not, why not? Why was she allowed not to tell them?? I know no one will ever see this because its so old but had to get it off my chest.