Why she killed her husband?

As you heard in the news, a man was killed by his wife. Why she killed him?
Of course I don't know why, but I heard some rumors from one of my friends, so I'll share that. My friend said;

• The husband worked for Morgan Stanley... so, his salary should be well and if he has a life-insurance policy, she could get much moeny.
• He tried to divorce his wife... she wouldn't like to divorce him?
• She loves brand name, not only fashion, but also other things like school... she loves her husband's company brand?