Former Detective Superintendent Tony Cook was a Senior Investigating Officer with Greater Manchester Police and is now a PIP Level III & IV accredited Regional SIO Advisor working for the National Crime Agency. His role involves advising SIOs and enquiry teams on best practice, useful techniques and procedures and is engaged in supporting numerous UK high profile serious and complex crime cases. He delivers training inputs to SIODP, DIDP and IMSC coursesand is an active member of the International Homicide Investigators Association (IHIA). He has written published articles relating to major crime investigation, is the co-author of Blackstone's Crime Investigators' Handbook and an administrator for the Major Crime Investigation community on PoLKA. AndyTattersall, formerly Detective Superintendent in the Greater Manchester Police on the Force Major Incident Team, retired in 2007 after 33 years' service and became the first ever Support Staff SIO in charge of a new Homicide Support Unit. A career detective with over 29 years in CID at all ranks, Andy is recognised locally and nationally as one of the most experienced investigators in the UK, holding the position of SIO for eleven years. He has led over 300 murder investigations, includinggangland shootings, child homicides, hospital deaths, no-body murders and the prosecution of terrorist Kamal Bourgass for the murder of Special Branch Detective Stephen Oake in 2003.Andy received the Homicide Working Group National Award for his Outstanding Achievement in the Field of Homicide inNovember 2006.