William Vinet was a staff doctor at St. Clair Children's Center.

He investigated Emily Christine Sim's odd growth on the back of her neck, and ordered a biopsy taken. While outside of the room, he was shocked to see that the other doctor taking the biopsy was harmed by out-gassing of blood inside.

Later, he took images of Emily and told Scully her tissue had started to necrotize, meaning she did not have much time. (TXF: "Emily")

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