of a break-in, but they did find a potential clue. on the kitchen counter, they found the valentine's day card john purchased for his wife. >> and the card read, "we are important, loving, caring people together. my life would be incomplete without you. i love you, john." >> the card susan gave to her husband had an entirely different message. >> one of the captions she had written herself said, "obviously, i bought this card before last monday." then as you open the card and begin to read the inside of it, she had written, "i bought this card two weeks ago, so they don't seem as appropriate now. i love you." signed, susan hamilton. >> police wanted to know what had happened two weeks earlier. dr. hamilton said they had a fight about money, but investigators found evidence that there was more to it than