Warning: This is 3.0 Edition material. It is possible that there is more recent 3.5 Edition version.
Inaccurate?

Lingering Damage

( Epic Level Handbook, p. 62)

[Epic]

Your sneak attacks continue to deal damage even after you strike.

Prerequisite

Sneak attack +8d6, crippling strike class feature,

Benefit

Any time you deal damage with a sneak attack, that target takes damage equal to your sneak attack bonus damage on your next turn as well.