I find it troubling that if the guy is obviously guilty of crimes that rate a 40 year sentence, that the DA offered letting him off with 19 months. How does that make sense either? The whole plea bargain game is a crock.
It doesn't make sense.
Perhaps the DA has political ambitions (Governor?) and wants to run on an impressive conviction record.
I understand that another trick is to load up the defendant with everything from the alleged crime down to jaywalking or littering, then say "We'll drop all charges except XYZ if you plead guilty".
Maybe I watch too much Investigation Discovery shows, but I often see a Murder One plea bargained down to Manslaughter or Abuse of a Corpse in dismemberment cases.