Because the murder occurred,there must be a reason to kill and motivated to commit murder. there is a planning as well and didn't happen for no reason. The most important thing is the motives for all crimes must be personal or effect to who that all of life. So all clues must be plainly stated and described. Such as he must ask the people who witnessed the events before the murder and those who knew the deceased, including characteristic and events surrounding the victim's death and to know who is the murderer.
there is a well-planned murder.