He did it
Somehow I came upon this blog entry of mine about a 2006 news report about a couple who were driving along a dark road, and somehow both the husband and wife got shot. The husband survived, however. Having heard of cases like this before, it seemed to me that the husband shot her and then injured himself to make it look like an accident.
Here's my blog entry about it.
Well, put their names into Google and you can see the result.