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Source: Ron Batzdorff/NBC

This Theory About Kate and Mark on 'This Is Us' Points to a Tragic Ending


We are barely halfway through Season 4 of This Is Us and already, it has continued to keep Kleenex in business because of its overwhelmingly emotional storylines. 

And ever since teenage Kate’s boyfriend, Mark (played by Austin Abrams) was introduced on the NBC series, fans have been in a tizzy trying to find out what happens between the teens. Nothing on this show goes unnoticed, though, and there is already one heartbreaking theory about Kate and Mark which could spell tragedy for the young couple.