Rabbi Birnbaum (first name unknown) is the religious leader of a Jewish congregation. When a Jewish baby with Tay-Sachs was found murdered, Rabbi Burnbaum's place of worship was tracked, and he was questioned.
Going through the members, it was revealed the baby is the daughter of Andrea Brown, who euthanized her child she conceived from an affair, with the assistance of Dr. Judah Platner, because the baby, Sarah, had a low life expectancy and Andrea and Judah wanted Sarah to be put to rest the way they deemed proper. (SVU: "Mercy")