The X-Files S05E15
Plot: In 1990 a man dies and the last word he utters is Mulder. Mulder thinking that this has something to do with his father, investigates and learns that the man supposedly died in 1952. He then goes to speak to Arthur Dales a retired FBI agent who was supposedly investigating the man then. Initially he doesn't want to talk to Mulder but later changes his mind and proceeds to tell him about the man whom he arrested and who later died while in custody and then later saw alive. He would also tell him that he was contacted by a man named Bill Mulder.
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