suicide

There is a famous fictional story about Ronald Opus.
short
On March 23, 1994, a man named Ronald Opus jumped from the top of a ten-story building in an attempt to commit suicide. As he passed the ninth floor, his life was cut short by a shotgun blast through the window. Neither the shooter nor the deceased were aware of a safety net installed on the eighth floor to protect window cleaners, a net that would likely have prevented his death.
Further investigation led to the discovery that an elderly couple lived in the room on the 9th floor from which the bullet was fired. The old man had threatened his wife with a rifle after a fight broke out between them. He became so angry that he could not hold the rifle straight. Therefore, when he pulled the trigger, he missed his wife, and the bullet went through the window and hit the deceased.

Normally, when a person intends to kill one person and accidentally kills another, he is considered guilty of murdering the other person. However, during the investigation, both the old man and his wife strongly claimed that neither of them knew that the shotgun was loaded.
It was an old custom of the old man to threaten his wife with an unloaded shotgun; he had no intention of murdering her. Therefore, the killing of the deceased appeared to be accidental. That is, the gun was loaded by mistake.
But an intensive investigation in which neighbors were questioned resulted in a witness testifying that their son had been seen loading the rifle about six weeks before the fatal accident. The investigation revealed that the mother (the elderly woman) had stopped supporting her son financially, and that the son, who knew of his father’s tendency to threaten her with the shotgun, had loaded the rifle in the expectation that his father would shoot his mother. The case once again became a murder case, with the couple’s son suspected of murdering Ronald Opus.
And here comes the final twist:
Further investigation revealed that the son, Ronald Opus himself, had become increasingly depressed in recent weeks over the failure of his attempt to have his mother murdered. This led him to jump from the ten-story building on March 23, only to be killed by a loaded shotgun shot through a ninth-story window.
The police closed the case as a suicide.
What does the rabbi think?
1. Halachically, is this defined as suicide? (It is forbidden to sit on it for seven days, do not say Kaddish, and other laws of suicide are known)
2. Is the old man guilty of murder (i.e. accidental)?