Continuing on with my reply from above. The jilted girl had taken the gun from the bed and used the opportunity to kill the husband knowing that the defendant would be blamed. The motive was the fact that she had been left at the alter. I don't know if it is old age but I have trouble following movies where there is a lot of different people with different names. If I had seen it the movies years ago, I probably would have never known what the motive was.