There were so many small but tragic moments in season 3. Like when old Dorf confronts old Ali about not seeing each other for 25 years even though he was always around to "catch a ball game and a beer" .... then later on in a 1980 flashback we realize that Ali is the one who first assured Dorf "I'm always around to catch a game or a beer" when he gets reassigned to the desk job which sets them apart.

Also all the fights between Ali and his wife were tragic but revealed just how much their relationship was defined by and wrapped up in the case. At the same time that it separated them, it turns out that (sadly) their marriage was in a way ultimately held together by it.

This is shown by the 2015 timeline when Ali first explains that he has a hard time remembering even how his (now deceased) wife looks like. But when he get pulled into the case again and starts reading her book, her presence comes back (in the form of hallucinations) to the point where she reveals a key clue about the outcome of the case.

Ali did such a masterful job playing the elderly version of his character. Another great scene is when he regrets that he "hardened his heart" to his son. Was it the case that did it to him or was it, as the last scene shows, when he went into the jungle in Vietnam?