If a divorced spouse fails to amend his or her will it will for a period of three months after the date of the divorce be interpreted as if the ex-spouse was predeceased. For the three-month period the ex-spouse will, in other words, not inherit in terms of the will even though it has not been amended.
If, however, the will is not changed after the three-month period the ex-spouse will again be entitled to inherit.
The effect of this principle therefore is that a divorced spouse has three months after the date of the divorce to amend his or her will to ensure that the ex-spouse does not inherit. The best approach obviously is to immediately amend the will as soon as you have made the decision to disinherit your spouse after the commencement of the divorce proceedings.