Puzzle

Ok herez a puzzle:

1. A man kills his wife at work.
2. She was wearing a new pair of shoes.

Find the correlation between the two.

Please note that the answer is perfectly logical. Please do not allow prurient thoughts cloud your intellect.

A few hints:
1. The man was not aware of the new shoes while killing his wife, but the shoes obviously are important.
2. The man was aware that he could have harmed his wife, yet persisted.
3. The husband and wife obviously are colleagues.
4. The wife did not make any kind of a noise due to which she was killed.
5. Ok, another hint, the wife was shot dead; And the gun being an important part of their work.
6. They do not indulge in any ethically or legally wrongdoings, neither do they work in any company/shop related to guns n ammunitions.

Let's see who can crack this.

PS: If you know the answer[i.e. you are absolutely sure], pls don't post it here. Mail it to me at kpowerinfinity[AT]gmail[DOT]com. I will let you know if it is correct.
PPS: You are free to ask any number of questions, post in the "comments" for everybody's benefit