The story of Ronald Opus started out life as a hypothetical problem raised in a dinner speech at a meeting the American Academy of Forensic Sciences by its then-president President Don Harper Mills. However, the (amazing) resurfaced on the Internet seven years later as an urban legend, and became a particularly virulent example of the form. The Ronald Opus story is now a feature in some law-schools, in which students are asked to evaluate the culpability of the various parties. Below is the whole story, collected by Snopes from a 1996 email (split for length). I'd love to see your thoughts on liability and culpability in the comments.
For those of you who were unable to attend the awards dinner during the annual [American Academy of Forensic Sciences] meeting in San Diego, you missed a tall tale on complex forensics presented by AAFS President Don Harper Mills in his opening remarks. The following is a recount of Dr. Mills' story:
On March 23 the medical examiner viewed the body of Ronald Opus and concluded that he died from a gunshot wound of the head caused by a shotgun. Investigation to that point had revealed that the decedent had jumped from the top of a ten story building with the intent to commit suicide. (He left a note indicating his despondency.) As he passed the 9th floor on the way down, his life was interrupted by a shotgun blast through a window, killing him instantly. Neither the shooter nor the decedent was aware that a safety net had been erected at the 8th floor level to protect some window washers, and that the decedent would not have been able to complete his intent to commit suicide because of this.
Ordinarily, a person who starts into motion the events with a suicide intent ultimately commits suicide even though the mechanism might be not what he intended. That he was shot on the way to certain death nine stories below probably would not change his mode of death from suicide to homicide, but the fact that his suicide intent would not have been achieved under any circumstance caused the medical examiner to feel that he had homicide on his hands.
Further investigation led to the discovery that the room on the 9th floor from whence the shotgun blast emanated was occupied by an elderly man and his wife. He was threatening her with the shotgun because of an interspousal spat and became so upset that he could not hold the shotgun straight. Therefore, when he pulled the trigger, he completely missed his wife, and the pellets went through the window, striking the decedent.
When one intends to kill subject A, but kills subject B in the attempt, one is guilty of the murder of subject B. The old man was confronted with this conclusion, but both he and his wife were adamant in stating that neither knew that the shotgun was loaded. It was the longtime habit of the old man to threaten his wife with an unloaded shotgun. He had no intent to murder her; therefore, the killing of the decedent appeared then to be accident. That is, the gun had been accidentally loaded.
But further investigation turned up a witness that their son was seen loading the shotgun approximately six weeks prior to the fatal accident. That investigation showed that the mother (the old lady) had cut off her son's financial support, and her son, knowing the propensity of his father to use the shotgun threateningly, loaded the gun with the expectation that the father would shoot his mother. The case now becomes one of murder on the part of the son for the death of Ronald Opus.
Further investigation revealed that the son became increasingly despondent over the failure of his attempt to get his mother murdered. This led him to jump off the ten story building on March 23, only to be killed by a shotgun blast through a 9th story window.
The medical examiner closed the case as a suicide.