Removing Ability to Collide at runtime?

An enemy dies and I dont want it clogging up the map (turn collision off - but not unregister object), I have tried all kinds of things, such as:

enemyCollision.OnCollision = null;
enemyCollision.ResolveCollision = null;
enemyCollision.CollisionLayerMask = 0;

where

T2DCollisionComponent enemyCollision = deadEnemy.Components.FindComponent();