Was Roh Moo-hyun's death actually a suicide?

There were no witnesses, and there were no bodyguards nearby at the time...
And they say the suicide note was typed on a computer..
In a moment of turning away from the world, a former president turns on a computer and types a suicide note in Word?
Do you really believe that?
Isn't it possible that a bodyguard pushed him to his death and then typed the note themselves on a computer?
Does that sound crazy? The people who cheer for assassins and believe it's the truth are even crazier..