Call 911: The first responders will need immediate access to the scene of the crime so they can assist the victim and start their investigations in order to try and identify the perpetrator if there is such a need. When you call 911 they will always dispatch the police and medical personnel to the scene immediately.
Evidence and Forensics: As soon as the victim has been removed from the scene and taken to the hospital or in the case that there was a murder the body has been removed, the forensic experts and detectives will start combing through the scene for evidence so they can start building a case against the attacker. This could involve dusting for fingerprints, taking pictures or looking for the pattern of blood splatters.
The conclusion of the Investigation: After all the evidence has been collected, the police and investigators will leave the scene because their job will have been completed; this may have taken a few hours or days depending on the nature of the crime or the details that were involved in the investigations. Once this is over, you will have to make crime scene clean up arrangements.
Crime scene clean up: It is always important to hire professional crime scene clean up companies to take care of the aftermath; these companies have trained professionals who use industrial grade cleaning solutions, equipment, and protective gear in order to sanitize the are back to safety. Crime scenes are biohazard risks and only a death clean up company can ensure that the risk is not spread further.