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Why does SalesForce on before delete trigger delete record before processing?

I have created a trigger in Salesforce :

Trigger myTestDelete_D on Account (before delete) 
 {
   set<ID> ids = Trigger.oldMap.keyset(); 
   myClass.Details('Account','delete',ids); 
 }

So the steps are I create an account Acct1. I then delete the account , but in the call to myClass.Details I perform a select to the account with the id of the Acct1.

The issue is that the row has already been deleted and hence I get 0 rows. Is there some sort of setting that is required in Salesforce to wait until the trigger has completed before the entity is deleted ?