In 1997, two women were mutilated and murdered on the grounds of a psychiatric hospital in Grangegorman, Ireland. Only months later, a young couple named Catherine and Carl Doyle were slaughtered in their countryside home in front of their four young children. All four of the victims were murdered at the hands of a young father named Mark Nash, who would eventually become known as one of Ireland's most violent and gruesome killers of all time.------>Thanks to our sponsor CEREBRAL - AFFORDABLE ONLINE MENTAL HEALTH SERVICES, INCLUDING PRESCRIPTION MEDICINE.  You can receive 65% off your first month of medication management and care counseling by going to WWW.CEREBRAL.COM/CONSEQUENCES---->Join us on Facebook and IG: @HARDCORETRUECRIMEWeb: www.crimesandconsequences.com-------->Get ad-free early releases of each episode, plus over 170 exclusive Members Only episodes by going to Patreon.com/tntcrimes or joining our Apple Channel on the Apple Podcast App. ------>Sources: 1) REPORT OF THE COMMISSION OF INVESTIGATION ON DEAN LYONS2) Article from Independent.ie/irish-news "Portrait of a serial killer: Mark Nash showed no emotion" 3) Article from Independent.ie/irish-news "I think he's a monster - Mark Nash's daughter describes shocking moment she discovered her dad was notorious killer"4) Article from www.thejournal.ie "Grangegorman murders: Serial killer's appeal against his conviction is rejected"#grangegormanmurders #marknash