R.I.P Tomato

Bad bad and bad news. My tomato plant has just died. A week ago it rained very heavily and I happened to place it on the edge of the balcony where it received the heaviest rain water. The next day, the leaves began to wilt badly. Upon inspection, I noticed that the stem weakened and rotted. I tried to regrow the roots by cutting away the rotted stems. The plant seemed to be healing for the next couple of days, but today it began to wilt again. I give up on the tomato plant and tossed it in the compost bin. Over-watering kills - lesson learnt!