Check for constraint on delete

How do you code a procedure to delete a record where if it has an
error (because of foeign key constraint , no cascade and related
records) it will continue and do an update instead.
I have tried this but it doesnt continue if the delete hits an error.
Thanks
Create procedure dbo.delete_record
@.id smallint
as
delete from table
where id=@.id
if @.@.error <>0
update table set deleted=1
where id=@.idwhy don't you update before deleting?