Here's what we know.
1. He worked for the DNC.
Congratulations, you got one right.
2. He had access to sensitive materials.
He was director of the voter expansion project. It is unlikely that he had access to emails such as those released by Wikileaks
3. Kim Dot Com claims he was in contact with Rich before he was murdered and he was very upset about corruption in government and wanted to make a positive change from within.
Who the hell is Kim Dot Com and why should we believe anything he says.
I looked at the website and to me he is just another non fact based looney.
4. Kim Dot Com hinted at the possibility that Clinton related documents would be released by wikileaks in a Bloomberg interview before it happened.
Now here is a clue as to who he worked for or with.
5. Wikileaks released the DNC and Podesta documents and emails.
Two right; I'm impressed. 
6. The kid got killed.
It's a trifecta.
7. The police are saying it was a robbery, but nothing was stolen.
The police said it was an attempted robbery or a botched robbery. Had it been someone seeking to make it look like a robbery, they would have taken something.
8. There are unsubstantiated reports that he was alive for 2 hours after the police got there, but we have no idea what if anything he said about the attack.
Not just unsubstantiated but contradicted by the official reports.
I see 2 possibilities.
1. Seth Rich was the person that leaked the DNC documents, he was killed for it, and there's a conspiracy to squash it because it would take down the DNC and perhaps some leading democrats.
2. Seth Rich was killed in a robbery or for some other unknown reason, Kim Dot Com has a relationship Assange and possibly the Russians (which is how he knew documents would get released), and he's lying to deflect attention away from the real hackers/leakers even though no one was looking in his direction before he came forward.
I know which one I think is more likely based on the available information.
