It's Rain Man on Law and Order, well, sort of. Pete was not autistic, he was mentally challenged but the premise was very similar. He was sent away at a young age and he ended up sticking up for his brother in the end, but ultimately it was not enough.
Law and Order is off to a pretty strong start in Season 19. The team of Kevin Bernard and Cyrus Lupo are really starting to gel extremely well and their dialogue just comes off as so natural. The entire show actually is portrayed in a very believable light as opposed to programs like Boston Legal where there isn't but a hint of realism.
Another good episode overall with a few trademark Law and Order red herrins.