What happened?

I think the woman was the dead man's wife: whether he was unfaithful - he had (a) mistress(es)-, or inversely, he was cuckold. Both reasons could explain that the woman killed her husband. In the first circumstance, she was afraid he was going to divorce, and so, before he left her, she murdered him in order to get all the money. In the second case, she still killed him for money: actually, as we are supposing she was unfaithful, she wanted to get money to leave with her lover far away, for instance. So, she shot her rich husband one evening in the conjugal room, then she pretended being desperate, got her inheritance, and a few weeks later, could leave with her lover who is either a Cuban immigrant or her gymnastics teacher, to tropical countries where the life expectancy is equivalent to thirty-five years, probably. Or maybe money didn't interest her: she killed him just after she had discovered he had a mistress, whether finding by chance a letter in her husband's suit or hearing, also by chance, a telephone conversation between her husband and his mistress. And so, invaded by an abyssal despair or by an unverifiable anger, offended in her self-esteem, she killed him: it wasn't a premeditated crime like in both precedent cases, but a crime of passion. But there is a second hypothesis: the murderer was his mistress! So, noticing her lover didn't dare to sue for a divorce when he had promised her, she murdered him because she couldn't live anylonger an illegitimate love story, not to profit fully from her man and to see her foe -the wife- spoiling her love life. By the way, we're conceiving she will kill the wife too, a few hours later!!!