I seem to recall a report about an unsolved knife murder of a couple in the pacific northwest, Washington area. I cannot recall the particulars, but it did get a mention early in this case.
So do I. In that case, the husband was killed, but the wife survived. I seem to remember the police saying there was no connection between the two cases, but I don't know why... Maybe this suspect wasn't in the area at that time.
I think this is the story: https://www.dailymail.co.uk/news/article-9940947/Oregon-wife-stabbed-19-times-intruder-killed-husband.html