If grass is killed by grubs, it may or may not come back, depending on the severity of the damage and the extent to which the roots have been affected. Grubs are the larvae of certain types of beetles and can cause damage to grass roots by feeding on them. If the damage is minimal, the grass may be able to recover on its own. However, if the damage is more severe, the grass may not be able to regenerate on its own, and you may need to take action to help it recover. This could include reseeding or laying new sod.