Render Layers Blocking Objects Question

PleaseHelpMe

I am currently trying to set up my scene so that I can render the groom and my character out on separate render layers. However when I have the two separated out the back of the hair that should be blocked by the head renders out as well. Is there a way to make sure that portion is blocked when rendering? 

PleaseHelpMe

I found the solution but posting here in case someone else needs it! Just override the head with a surface shader and set out matt opacity to black.