How to kill your wife avoiding prison

Italian justice system has lots of problems, first of all the most time consuming legal processes in Europe and the uncertainty of punishment.
A famous Italian journalist ,Marco Travaglio, explained a worth example about this problems. More in detail he demonstrated how you can kill your wife (or vice-versa) without
spending a single minute in prison.
Here's a step by step explanation :

1. Kill your wife (the method it's up to you)
2. Go to the police station ,surrender and confess.
3. Tell to the police that she voluntarily offended you causing your overreaction.
4. After this few steps you have already avoided preventive detention because: A) There's is not an escape danger (you surrendered). B) There's not a risk of tampering with evidence (you confessed). C) There's not a risk of reiteration of the crime (you got just one wife...)
   
5. Waiting for the trial to start you are in house detention (1 year) but you can go to work (if you still have one).
6. When the trial begins you risk the maximum punishment, 30 years of detention.
7. If your personal lawyer is smart enough, extenuating circumstances can be more than aggravating circumstances.In this case the punishment decrease to 21 years.
8. Since you were offended and provoked by your wife, the punishment can be lowered subtracting 1/3. Now the punishment is 21 minus 7 = 14 years.
9. Common extenuating circumstances are almost always given to the respondent ,so 14 - 5 = 9 years.
10. If you pay reparations to relatives of you wife your punishment is decreased and reach 6 years.
11. If you ask for shortened rite the punishment is knocked down to 4 years.
12. Since you stayed in house detention for 1 year you can subtract that time and get 4 - 1 = 3 years.
13. Punishments during 3 years or less can be converted to social services work.

Conclusion.
You killed your wife and you still don't know how looks a jail. Perhaps it can be a better option than divorce..