Basically, the judge sentenced him for a crime that he wasn't convicted of (murder-for-hire): 'When she [the judge] gave him double life plus 40 years, she said the "murders significantly justified the life sentence."'
The most heartbreaking part of the story is the letter Ross read to the judge before sentencing:
"If you find my conviction warrants a sentence that allows for my eventual release, I will not lose my love for humanity during my years of imprisonment, . . .
I will do what I can to make up for not being there for the people I love, and to make the world a better place.
Even now I understand what a terrible mistake I made... I know you must take away my middle years, but please leave me my old age. Please leave a small light at the end of the tunnel ... a chance to redeem myself in the free world before I meet my maker."