Series 1. State Police Investigation Files, 1919-1998, contain records relating to specific cases under investigation by the State Police. Some of the landmark cases that are included in these files are: the Hartford Circus Fire, the Niles Street Hospital Fire, the Taborsky-Columbia Murder Case (Mad Dog Killers), and the State Leasing Probe. Also included are several files relating to other murder case investigations. The investigation files contain witness statements, investigating officer notes, background information, suspect files, photographs, and reports. Even after an official investigation has been closed, the investigation files may be updated with follow up reports, inquiries and records relating to subsequent re-examination of the original investigation, as is the case of the Hartford Circus Fire.