After a shooting has occurred people often make mistakes in dealing with police and crime scene. 

1. Do not "improve the crime scene"  by dragging the body inside the house.   Forensics will prove that you tampered with the evidence and even if you were innocent you will be guilty of tampering. 

2. Do not make statements to the police other than giving your identity.   You were under stress at the time of the shooting and your ability to observe what happened was poor.  Also you will tend to make statements that will be used against you later.  You will almost always be arrested.  Do not try to talk yourself out of it and end up talking yourself into prison.  

3. Do not leave the scene.  This makes you look guilty.  Instead have someone call 911 and report that you were attacked (presuming that you were surely attacked) and wait for the responding unit.  What is said during the 911 call is recorded and may be used against you later.