Updating system catalogs after a tuple deletion

Hi guys,

I have an experimental piece of code like this (that tries to remove
pg_relcheck entries):

deleted = 0;
while (HeapTupleIsValid(tup = heap_getnext(rcscan, 0))) {
simple_heap_delete(rcrel, &tup->t_self);
++deleted;

/* Keep catalog indices current */
CatalogOpenIndices(Num_pg_relcheck_indices, Name_pg_relcheck_indices,
relidescs);
CatalogIndexInsert(relidescs, Num_pg_relcheck_indices, rcrel, tup);
CatalogCloseIndices(Num_pg_relcheck_indices, relidescs);
}

What do I use instead of the CatalogIndexInsert command to tell the index
that a tuple has been removed? I don't see an equivalent CatalogIndexDelete
function...

Is there a better way of doing this?

Chris