About NLIS Investigations, William Dorsch

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NLIS Investigations is devoted mostly to Homicide and Death investigations. As an experienced Chicago Police detective William Dorsch was responsible for Homicides, Death Investigations and Police Involved Shootings. His clients are either experienced Defense Attorneys or families of victims who are not satisfied with the progress of a police investigation.

     In either case, my approach to my investigative task is the same. It begins with a review of the available police reports and a conference with the attorneys or family members. A return to the crime scene is necessary so that I can accurately understand the area where the crime occurred. This understanding allows me to formulate questions when canvassing the scene or when I interview witnesses. Often new witnesses can be found during the canvas. The identification of new witnesses who had never been interviewed by the police is a new revelation that can change a defense attorney's strategy for trial or new evidence that can be brought to the police in an unsolved homicide.

     Also of value is my ability to accurately report all that I had learned to the client. At trial, I have often been called to testify as an expert witness. My investigations are based on a solid understanding of the legal system, the gathering and understanding of evidence, my ability to locate and interview witnesses, and my ability to work with police officers, attorneys and family members.
     I also have an advantage in that I know what the police did right, what they did wrong, and what they did not do that should have been done.

William Dorsch


Qualified by more than 25 years experience in law enforcement and as a Private Investigator in Chicago, Illinois and Wisconsin. Retired from the Chicago Police Department in 1994 ending a 25-year career as a homicide detective. A solid knowledge of the Criminal Justice System, coupled with investigative skills and courtroom experience. The ability to locate and interview witnesses, accurate reporting and a good working relationship with both prosecution and defense attorneys.

  • Licensed Private Investigator and Agency owner in Illinois and Wisconsin since 1998.
  • Training Instructor in Wisconsin, responsible for training and certifying new officers in 1998 and 1999.
  • Investigated many high profile cases while working as a detective in the Chicago Police Department, responsible for homicide and sexual assault cases.
  • Experienced case manager with a good working relationship with Federal, State and Local Law Enforcement Agencies and the news media.