Thanks for the link to this article. Sounds like there may be more follow up articles to come.
The article mentions that Collins was the main suspect in 7 Michigan murders and one murder in Salinas California.
One Michigan murder - that of Jane Mixer - it states was later (2004) connected to Gary Leiterman who was tried and convicted of it and given a life sentence. He died in the past year.
The article mentions that some investigators think Collins may have committed other murders as well. This was certainly true at the time frame of 1967-1969 even before Collins was identified as their suspect. There were at least two other murders which were thought to be part of the series, but which were later tied to other individuals (separately).
Collins was only convicted of one murder (Karen Sue Beineman). Although there was much circumstantial evidence and clues which tied him to other murders, it was not as strong and compelling legally. Things like items of one victim being at the site of the next murder tied them together, but not necessarily to Collins.
There is also the question: "Did Collins act entirely alone - or did he have accomplices?"
All of the cases associated with the Michigan Murders, were known murders in which the body was found more or less in the open. What of other possible cases in which a body was NOT found, but the person went missing?
In the case of Roxie Ann Phillips, murdered in Salinas, CA - It is almost certain that Collins killed her and forensic evidence was found in his car upon his Michigan arrest. California authorities requested that Collins be extradited from Michigan, but their request was turned down until after the Michigan trials. Later, after Collins' conviction in Michigan, he was offered to California for trial in Roxie's murder, but California then declined.
My reason for mentioning Collins in this thread on Niki Britten is that Collins and his friend Manuel were at the time in transit by car from California to Michigan, and could have passed thru Oregon while enroute.