Twenty-five years ago, Milwaukee resident Jeffrey Dahmer was tried and convicted of 17 gruesome murders, shaking the public’s perception of evil to its core. The shocking nature of his crimes - luring young men into his home, where he drugged, sexually violated, killed and eventually consumed his victims - unmasked a madman walking in the shadows and launched the question: How did a once mild-mannered, handsome young man become one of history’s most terrifying and unexpected serial killers? During his time behind bars, one of the nation’s leading investigative journalists, Nancy Glass, secured both exclusive access and the first televised interview with Dahmer, developing a candid relationship in which he divulged the darkest details of his life and crimes. Oxygen Media’s two-night special “Dahmer on Dahmer: A Serial Killer Speaks” offers a fresh look at the infamous serial killer’s life through the eyes of the woman who became his closest confidant. With new interviews from pivotal figures in the case, the series sheds light on the grizzly and complicated investigation.