What happens to Simon Legree after Tom dies?

After Tom's death, Legree begins drinking heavily, and he sees visions..... ghosts. He lays raving, frightened, and screaming.

After this, Legree became a harder drinker than ever before. He no longer drank cautiously, prudently, but imprudently and recklessly.

There were reports around the country, soon after, that he was sick and dying. Excess had brought on that frightful disease that seems to throw the lurid shadows of a coming retribution back into the present life. None could bear the horrors of that sick room, when he raved and screamed, and spoke of sights which almost stopped the blood of those who heard him; and, at his dying bed, stood a stern, white, inexorable figure, saying, "Come! come! come!"