DO WE HAVE A CASE ON NON JUSTIFIABLE HOMICIDE

MY FATHER WAS SHOT 11 TIMES AND KILLED BY POLICE OFFICERS THEY SAY HE AGGREVATED ASSAULTED THEM BUT REPORT SAYS NOT APPLICABLE ON ALL 3 OFFICERS MY FATHER DID HAVE A GUN ON HIS WAISTBAND BUT WAS NEVER IN HIS HANDS THEY SAID HE WAS WAVING IT AT THEM HE NEVER DID THEY SAY HE WAS COOPERATING THEN THEY SAY HE WASNT HE DID HAVE SEVERAL SHOTS FROM THE BACK TO THE FRONT . HE WAS ASLEEP WHEN THEY APPROACHED HIM SPAYED HIM FIRST THEN SHOT HIM ONCE THEN OTHER 2 OFFECERS SHOT HIM 10 MORE TIMES WILL ALREADY HAVING HIM ON THE GROUND THEY SAY HE WAS ON DRUGS (?) ( I NEVER SEEN MY DAD ACTING STRANGE OR AS IF HE WAS ON DRUGS ) HE WAS A 60 YEAR OLD MAN THAT HAD SLEEP APNIA COULDNT HEAR VERY WELL AND COULDNT SEE VERY WELL ASWELL I CANT SAY HE WASNT ON DRUGS CAUSE AUTOPSY REPORT SAYS HE DID HAVE IT IN HIS SYSTEM BUT I STILL THINK THEY HAD NO RIGHT TO KILL HIM LIKE THAT BOTH HIS AUTOPSY AND DEATH CERTIFICATE SAY HOMICIDE.