Hey Victor,

I can think of a workaround:

By default, Umbraco creates a relation "Relate Parent Document On Delete" when you delete a node. You can see this in Developer > Relation Types.

Using the RelationService you could fetch this relation and use it to find the parent ID of the deleted item. A crude example:

var relations = ApplicationContext.Services.RelationService.GetByChildId(1123); // ID of your deleted node
if (relations.Any())
{
    var deleteRelation = relations.Where(x => x.RelationType.Alias.InvariantEquals("relateParentDocumentOnDelete")).FirstOrDefault();
    if (deleteRelation != null)
    {
        @deleteRelation.ParentId
    }
}