Weird somber feeling

I found out this morning that one of my patients died of a heart attack yesterday. He was 54 and lived alone. He had an appointment yesterday, and had never missed an appointment until then. We had left a message checking in. A friend, who he referred to us as a patient, was in this morning and told us the news. It's left me with a weird somber feeling today. He was a very kind man, very genuine and thoughtful. A few weeks back he had brought me a plant -- a pregnant onion -- that we had discussed one day. He had made such a turn-around in his care, going from crutches or a cane and barely able to walk, to walking briskly and returning to work. It's just sad.