. >> unrest andinveig >> reporter:ury overhe city.year across the country. >> for every george floyd, there are literally dozens of walter wallaces. >> reporter: for each life lost, a family left behind fighting for change. eric garner's family battling to ban police chokeholds. breonna taylor's mom rallying against no-knock warrants. for wallace's family, how police respond to mental health. the family enlist the help of attorney chaka johnson, a former philadelphia police officer himself. >> when you hear mental health challenge, you have to wonder why deadly force when dealing with someone who is having a crisis. >> this narrative, that oh, he has a criminal record, and he was amped and dangerous -- >> right. >> what do you make of that description? >> when it is someone killed at the hands of police, we engage in victim blaming almost immediately. we don't go into that level of inquiry as it relates to the officers. >> reporter: the wallace family has filed a wrongful death lawsuit against the two officers. sean moderaso and thoma