After careful consideration, I have determined that Johanna's solution is close enough. Technically the solution is as follows:
The Solution
The wife boosted her diabetic husband's insulin concentration, substituted artificially-sweetened candy for his real candy, and her husband went into a coma and died as a result.
Here is the new case:
Initial Amnesia
Solution Value: 7
The Case
A young man wakes up on the side of a desert road with a nasty bruise on his temple. He has no car, no possessions, and no clothes to his name. In fact, he can't even remember his name, since the blow to his head has left him with amnesia. Desperately, he looks around in search of a clue that might tell him who he is. That's when he notices a tattoo on his left arm. There are three short rows of letters:
Eb - Ob
wsn
SWIS S
The Mystery
Who is the young man and what happened to him?