The Michigan Murders were a series of highly publicized killings of young women committed between 1967 and 1969 in the Ann Arbor/Ypsilanti area of Southeastern Michigan by an individual known as the Ypsilanti Ripper, the Michigan Murderer, and the Co-Ed Killer.
The Ypsilanti Ripper killed young women in the Ann Arbor/Ypsilanti area of Southeastern Michigan in the year 1968
Just because the murders were from 1967-1969 doesn't mean any took place in 1968. He could have killed them in 1967 and 1969