What was the only Tropical Storm that had its name retired?

It was* Tropical Storm Allison that flooded the Houston, TX area in June of 2001. Rain amounts were absolutely incredible with this storm. Thirty-seven (37) inches of rain fell in one hard hit area. The storm killed twenty-two (22) people as it just stalled in one area and unleashed heavy rains for days.

Katrina has been added to this list.