Were the amounts vlarge to warrant such despicable action?
Quite a lot as far as I know; there were certainly a few loans taken out, all in a short space of time. As well as dealing with grief, they also had banks and other loan companies intermittently contacting them to chase debts over the following couple of years. It took a long time to sort out, and I'm not sure if it's finished yet.
Was there a police investigation to accertain what happened the the perps of the scam and murder?
Yes, though nobody was ever charged. The lady was found buried in a forest, by (I think) someone out for a walk.
Do u suspect corruption in the police or persecution services?
The lady's family and their lawyer suspect something involving a local politician near Warsaw.
I'd best not write too much more; the lady was my friend's mother, and although he doesn't read this forum afaik, he does speak reasonable English and could potentially see this.
I know of another case in Podlasie (which may be apocryphal). A gentleman went to America to live, returned unexpectedly a few years later and found his house had been sold by someone who had his old dowód osobisty. Allegedly the lawyer who handled the sale was responsible.