Jerry was quite a lot older than Esther. As she related, he told her when they first hooked up that he was likely to die before she did. It sounds like he pretty much expected it, and so did she. As for his death... It sounds like it was actually pretty quick as these things go. It wasn't a long, lingering, agonising death like some people experience. He escaped the sometimes horrible side effects of the chemotherapy. He had enough time to put all of his affairs in order and say goodbye to everyone he would have wanted to farewell. People who loved him had time to prepare for his death, so it wasn't a sudden shock. Perhaps that's how he wanted it? Not the specifics, necessarily, but maybe he wanted some advance notice and prep time and so on. A lot of people would prefer that to a sudden, unexpected, immediate death.