What was the motive for killing GH?

You check your mental notebook, thinking about everything you remember about Grand Homme. He hadn't yet clocked out for the night, so he was still working in some form when he was killed. He sent something out before the murder was reported. The only other "backroom" employee still around at the time of the murder - the first murder - was CS, who clocked out five minutes before the murder was reported. There's nothing apparent to you for motive. There must be something in there, though.