The criminal justice system is in a state of crisis, and one of the significant indicators of this crisis is the long delays in the investigation of murder cases, particularly in Assam, India. Delay is the deadliest form of denial. When inadequacies within the system fail to ensure timely justice, especially when it comes to a murder investigation, the accused is put to severe and irreparable hardships and, on the other hand, families or relatives of the victim face secondary victimization perpetrated by the slow-paced investigation. Hence, justice delayed is justice denied in another form. When justice is denied, the law becomes toothless, and liberty becomes meaningless, questioning the fundamental purpose for which the state is constituted. The role of an investigating officer in the criminal justice system, particularly in the context of murder cases, is pivotal to ensuring a fair and timely trial as they are the first to identify the accused of murder and come into contact with the witnesses and the victim. The investigating officer helps the prosecution to prove the guilt of the accused in the murder trial, but there are many reasons or factors which influence the timely investigation of murder cases. Thus, this paper makes a comprehensive analysis of the investigation process and powers of the police, provisions relating to speedy investigation under the Code of Criminal Procedure, 1973, and new provisions added under the Bharatiya Nagarik Suraksha Sanhita, 2023 and the Indian Police Act, 1861. Further, this paper also examines the challenges that the investigating officers have to face, which cause delays in the investigation of heinous offences like murder and suggests reforms that can be adopted for speedy disposal of murder investigations in the State of Assam.