You're wrong. Pak did commit a few crimes that night.
a) Brewer booked the date with Pak, not SG, it's even in the Suffolk County legislature from May 5, 2011
confiming that Brewer contacted Pak directly;
b) accepting the money from Brewer (Brewer let Pak in OB at gate) Brewer paid up front or SG doesn't enter the house;
c) driving Shannan to a john's house for purposes of prostitution is a crime;
d) being a 3rd party to benefit from Shannan being prostituted is a crime; the sale of a human being is trafficking;
e) Pak has said he saw her fleeing for her life and he did nothing to help her, she died;
2nd degree (involuntary) manslaughter. Pak acted recklessly. He could be facing 25 years if Spota had any
common sense at all. But we all know who Spota is the sugar daddy of, right?
It is only a crime if it can be proven. Of course we all know what they were all there for, but knowing and proving are two completely different things. To prove that prostitution was involved you have to prove that money was offered in return for sex, this is not that easy and is why prostitution is commonplace while relatively few people are charged with crimes associated with it. SG was hired as an escort, and that is not illegal. It is also not illegal to have sex with a stranger. Escorts get away with it because their agency is paid for their time, but how they choose to use that time is up to them. So the money is not for sex, it is for time. The sex is something they choose to do independently from that. In order for a crime to have happened there has to be a direct offer of sex in return for money. You need someone to testify to that effect, which is why prostitution arrests are usually done through some sort of sting with an undercover police officer either as the client or escort. If there is no police officer involved there is no witness and hence no crime that can be proven in court.
Sophisticated escorts generally are not stupid enough to ask a client for cash directly for sex. Usually both her and her client know what they are there for, and there is no conversation about it. Also, money is not handed over directly. It is done discretely, typically the client will "accidently" leave an unsealed envelope on a table along with his jacket or whatever, then ask to use the washroom. When he returns the envelope will be gone and he will not mention it again. Money is never spoken about, nor is it ever visible. Sex is never spoken about. It is done that way so that the law is not directly broken. High to mid end escorts rarely get into trouble with the law for that reason. Usually the ones that have problems are the low end ones or the streetwalkers, because they tend to be unsophisticated or careless about the finer points of legality, which means that they are easy for police to catch.
Pak did try to help SG, saying he did nothing is incorrect. He tried to reason with her when she went off the deep end, he went searching for her when she ran off, he continued searching the following days when she failed to turn up. There is nothing reckless in his behavior to the extent that it would rise to the point of liability in manslaughter. What happened to SG is tragic, but it was of her own making and there was not a whole lot more that Pak could have done.