warning : graphic video .
video of eric harris 's shooting released by tulsa county sheriff 's office .
shows deputies chasing harris , 44 , through tulsa , oklahoma , on april 2 .
they tackle him to ground ; reserve deputy robert bates shouts ` taser ! '
but instead of pulling out taser , he takes out service weapon and fires .
bates says , ` i shot him ! i 'm sorry ! ' , while harris begins yelping in pain .
suspect , being held down by his neck , then says : ` i 'm losing my breath '
other unidentified cops tell him , ` f *** your breath , ' and ` shut the f *** up '
harris was later hospitalized , died an hour later ; investigation ongoing .