 Olivia and Peter turn to an expert in <unk> , Dr. <unk> ( Mark <unk> ) , to trying to learn more about rapid aging , but Dr. <unk> cannot help them further , though Peter suspects he is hiding something . Unseen by the Fringe division , Dr. <unk> visits an abandoned warehouse and meets the murderer , Christopher ( Derek Cecil ) , his son , who suffers from rapid aging syndrome . <unk> warns Christopher to be careful and that they only need one more woman to complete the process . By this time , Charlie has found a recent murder victim killed in the same fashion as Olivia 's serial murderer . At Walter 's lab , they identify the <unk> <unk> has been removed . They <unk> the murderer must extract hormones from the glands to slow down his own aging process . Walter <unk> they can discover the location of the crime by looking at the images left in the woman 's optical nerves induced by the <unk> <unk> . <unk> an electronic pulse camera from Massive Dynamic , they discover the image of a suspension bridge near <unk> and identify the likely location from which it was viewed — the same warehouse that Dr. <unk> visited . The FBI converge on the building , and Olivia and Peter find <unk> about to cut into another victim . Olivia chases off after Christopher , who eventually <unk> to his rapid aging and dies , while Peter , after <unk> <unk> with a bullet , <unk> with Walter to apply a makeshift <unk> to bring the victim back to life . 
