Film?

Rating: Null/10 (11 August 2014)

What's the name of this film!?
Here's a brief overview. The film I think it's from the early 1990s. It starts off with a married couple, the wife has blonde hair, they seem happy for a while, but then argue a lot and decide to get a divorce. The husband moves on with his life and meets someone else and marries her, her previous husband was killed in an 'accident' - during this time, the husband has rekindled his friendship with his ex-wife, the man and his ex wife soon become very close friends again (nothing going on), they joke together about what if his new wife killed her previous husband, and the guy says if anything ever happens to me let the police know, this is all said as a joke. Anyway soon enough the new wife kills her husband (I think she is maybe jealous of his friendship with his ex-wife) it is all made to look accidental (again) The ex wife suspects something, and the joke they both made about if anything happened to him kept playing on her mind so she went to the police. They can tell that his actual wife doesn't seem that upset compared to the ex wife who is really grieving for his death. I think in the end the wife is caught out and is charged with the murder of both her husbands.
I'd love to watch this again I saw it on TV when I was young, it would have been early 90s I can't say when it was made exactly.
Any suggestions appreciated.