By Ewan Gleadow Brit killer James “Porky” O’Rourke has been named as one of 10 most dangerous inmates in the world after admitting to murdering a fellow inmate. The double killer is expected to spend the remainder of his days behind bars and is unlikely to be released after claiming responsibility for the brutal beating of a fellow inmate in an execution three years ago. Spending 31 years behind bars, O’Rourke has since appeared in High Court six times for prison attacks and received an extra 35 years added to his sentence. On top of this, he received a second life sentence. O’Rourke, 53, has …