"Alongside the fact he clearly tried to hide the motive, much more then Ms. Kate did- when she flat out admitted what her motive was. However, it is clear Henry had no intentions of spilling it. Plus, he wears facial cream. Something Ms. Kate does not, from what I have observed from her appearance alone. Alongside that however, he was at the party. and admitted that he had the type of drug used to drug the victim at his disposal. so, It's clear that he has MMO. It is now a simple matter of proving him guilty, which should be easy.  And confront him at the stock market, getting him called in would give him more valuable time to think of a response. if we catch him off guard though, it is much more likely for him to  crack under pressure then if he comes prepared. it is a simple matter of criminal psychology, really. But, I'm getting off on a tangent. call him in, and we'll take it from here." He'd look over at Jones with a look of preparedness, almost as if he had been planning this entire route of attack the entire time.