" My assumption is the killer was probably someone in government be it a ex-cop/military. "
I don't assume that, any more than I assume Jack the Ripper was a surgeon. The Ripper's mutilations could have been done by anyone who'd ever butchered a large animal, and anyone who was either clever or lucky could have eluded the police of that era. There was no DNA evidence then, the crimes didn't involve leaving fingerprints, the crimes took place in several jurisdictions, and were without useful eyewitnesses.
Now of course there are above-average chances that the killer was in the police or military at some point, because a violent man might prefer a career where he'd get paid to be violent, but that isn't proof, it's just a slight statisitcal preference. But the fact that he wasn't caught doesn't indicate a cover-up, it doesn't indicate military/police malfeasance, and the fondness for codes doesn't indicate a military/intelligence background either. If I remember correctly the people who solved the ciphers weren't military-trained, they were just ordinary people who liked word puzzles and problem-solving, some people just like codes and puzzles, and a regular citizen could have learned how to make up codes for the price of a library card. And really, the police of that era couldn't trace snail-mail, and had no finger prints or witnesses, there was never enough evidence to convict anyone.
reply
share