Serial killers can stop killing, this has been proven many times in various cases. The problem with this train of thought is you narrow the focus. It is quite likely you will have serial killers that have different MO's, ways of killing, ways of disposing, and also have them stopping intermittently, whilst they evolve there evil ways.So we know serial killers simply do not stop killing, if he was in jail for another crime then there would be a dna sample to match the sample police have, if he had been arrested but not convicted of a serious crime then there would also be a match in the system, so either a) the CSK is dead or b) he is still operational either in WA, other states or overseas. either way he has never been convicted or arrested for a sexual crime/murder/man slaughter which means this guy is good, real good.
I've spent countless hours on the missing persons database and crime stoppers sites for each state trying to link unsolved murders/missing persons into categories of possible serial killer victims.
Adelaide had a group of murdered/missing females around 1997/1998 and Queensland 1998/1999 then WA again in 2000/2001 however most cases don't list the method of murder and as for missing persons well not even police would know until a body was found so this makes any link between crimes pure speculation on my part. But I did note a few victims among them that had a very similar appearance to the CSK victims, and the CSK moving around would explain why he was able to continue killing without being caught.
The problem with this also is the police are often very reluctant to say 'we have a serial killer on our hands' I'm surprised even the WA police come forward stating so after only a couple of murders and no dna evidence to link them at the time. I wonder if they would have had a better chance at capturing the killer if they didn't make this public knowledge and spook him?
WA alone has multiple cases of this as an example. Eric Edgar Cooke, and Richard Dorrough, Morey is suspected to have had different MO's for each of his victims, he had easy targets, and also suspected of the Sarah McMahon, and Lisa Brown dissapearences..
Start thinking outside the box with WA serial killers. In the USA there have been Police serial rapist and serial killers, you have guys like the Night Stalker, and the Original, who did anything and everything to there victims.. Its a crazy world in the mind of a serial killer