Using the "Suicide" button on the List Management panel is generally only for "After the Fact" list manipulation to repair a list that did not receive some loot events that occurred, and as such, should be used with great caution.

This button has two different behaviors, depending on whether you are in a current raid, or not.

Behavior while in a raid

While in a raid, the suicide works as you would expect. The "selected" player becomes the "winner" of the suicide event, and any other players in the raid (and in addition, any players marked as "reserved") will move through the roll list according to the normal rules.

Behavior while not in a raid

When not in a raid, if only a single player is selected, the "Suicide" button does nothing (if you think about this, you are effectively suiciding a person in a 1 person list, so their position will not change). However, in order to effectively manipulate the list to simulate a proper loot event, place any player who would have been in the raid as "Reserved", select the player who won the loot event, and then click on the "Suicide" button.

Further reading:

• Visual Example of Suicide
• Using Player Reserve