Who are you?
IP address? Well that's easy. He would have to be stupid to hack via his ISP unless routing through several Chinese or Russian proxies, even then there are still links back to your ISP account, although getting server logs from open proxies in China and Eastern Europe/Russia would be tricky.
Then there are so many insecure wireless networks that one would never have to hack from the same one twice. Although neighbors may report strange vehicles parked in the area for an unusual length of time, so it's not entirely risk free. But if he is good with scripts most of the hacking can be automated.
From the Telegraph:
"He also took rent money somebody had been paying their landlord via bank transfer and directed money to himself that someone had put aside to buy a car."
"...directed money to himself..." being the pertinent info.
The problem with any fraud is collecting the cash, the funds have to be transferred from somewhere to somewhere and unless a false identity is used at every stage, it is going to lead back.
There are ways to avoid detection, but I would have to kill myself if I told you.
It's a shame about my moral compass really, I could be a rich man, but would I be happy?