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Episodes: "It's the End of the World" and "As We Know It"
The Friday Night Lights alum plays a tough-as-nails bomb squad leader who helps evacuate the hospital when a man comes in with a live explosive in his gut. The sometimes-brash Dylan helps Meredith stay calm after she's forced to put her hand inside the man to stabilize the bomb. But after she hands the bomb off to Dylan, he's blown to bits (pink mist) right in front of her. He later appears in Season 3 when Meredith drowns, coaching her in the afterlife to return to the living.