Deadly Strike
This is a chance of doing double damage. This bonus is applied after skills such as Critical Strike and any other damage bonuses. Critical Strike (CS) and Deadly Strike (DS) exclude each other.

If you have a 33% Deadly Strike item, and 68% Critical Strike Skill the complete chance to get double damage is:

=CS + (DS/100)*(100-CS)
=68% + (33/100)*32%
=68% + 10.56%
=78.56%

http://www.battle.net/diablo2exp/items/magic.shtml#sma

Thats all I could find.