http://archive.is/2016.12.13-125236/http://greece.greekreporter.com/2012/11/22/bomb-explodes-outside-greek-deputy-prosecutor%CE%84s-home/

http://archive.is/JJPWU

Panagopolous was kidnapped in 2009 for ransom. I haven't found any info that says the kidnappers have been caught.

Extremely wealthy shipping magnate. His Wikipedia page is strangely short.

http://archive.is/8sY9c

Could be a dead end, but better to have left no stone unturned.