The ending that should have been, was.
I can see lots of disagreements with this review of this episode coming now...from those whose only reason for disagreeing was that they were expecting a different ending.
First half of the episode was well handled. Boy shows up covered in blood from what turns out to be his dead nanny. Stabler goes on TV with boy to find his father which happens. Wife caught cheating. Husband is not biological fatber of boy. Biological father files for custody. Wife wants divorce. Husband kills wife. Husband tries to commit suicide. Stabler goes to see husband while Benson takes Kathy to doctor appointment.
The ending that should have been, was. Kudos to the writers.