ONE person had the gun
ONE person had his finger on the trigger
ONE person pointed a gun at a live person
ONE person negligently pulled the trigger
ONE person negligently killed a person

There is NOTHING else to the story no matter how much smoke and mirrors folks add to protect the person that NEGLIGENTLY fired the gun and NEGLIENTLY KILLED a person

Poor outcome?

HE KILLED A PERSON.

Some spelling errors can be corrected by a vowel movement.
~ MOLON LABE ~