I live in this area and drive by the location where DC was found as well as where the belongings were found on my way home from work. This is my attempt at a map. ( Not sure how it's going to show as I am new to this)
The red circle is the location where the KFC was at 200 Broadway in Waterloo.
The blue circle indicates where DC was found.
The black circle where the belongings were found.
At the bottom of the map you see US Highway 20. It was relocated there in the mid to late 80's. At the time of the murder in 1974, US 20 ran from the KFC to the body location along what is now known as IA Hwy 57. It was the main east-west route through the upper half of the state. Anyone travelling through the state would have used that route. DC traveled from Dubuque to Independence to Waterloo along US 20.
At the location the body was found none of the housing you see was there at the time of the murder. The only thing that was there was the farm acreage on the SE corner of Union and IA57(Old 20) and the house on the NW corner of same.
Pretty much all of the housing you see on the route between the body and the belongings was not there at the time of the crime. It was all farmland with maybe 2-3 acreages along the way. As far as I know, none of the houses along Viking were there either.
Pure speculation follows:
It is possible that the killer(s) were travelling west through the state and offered up a ride at the KFC. Whether or not DC was shot in the car or at the location of the body is unknown. It's possible that the killers just pulled off US20 onto Union Road to either commit the murder or get rid of the body. It would have been the first road they came to after leaving the Cedar Falls city limits. They could have then continued travelling south on Union to put some distance between them and the scene. Could have been going through belongings looking for something of value then discarded on Viking Road when finished.
Again, pure speculation.
Blue X- Location of body. None of the houses to the east were there in 1974. It was farmland.
Approximate location belongings were found along Viking Road. As far as I know, none of the houses on the north side of Viking Road were there in 1974.