When Bonnie finds out Adam may have cancer. She says "I'm too young to be a widow!" This ignores the fact that she had reunited with her ex-husband in "Leather Cribs and Medieval Rack". Things were rocky at first and that story-line continued for 13 episodes where Alvin died in "Three Smiles and an Unpainted Ceiling". They were headed toward remarrying before he died. But it was unclear if they needed to marry. Alvin had run out on Bonnie on the night that their daughter Christy was born. SO, technically or maybe really Bonnie was already a widow.