Just after midnight on 9 August 2015 - the anniversary of Michael Brown Jr's death - Michael Brown Sr was at Knockouts Bar & Grill with his wife and their friends.

It was "Viking Night," a periodic gathering of the alumni of Normandy Senior High School, where both Brown Sr and Michael Jr attended. The father graduated in 1997, the son in 2014 - just eight days before he was shot and killed by police officer Darren Wilson.

Inside the crowded club, Brown Sr can't walk more than a few paces before someone stops him.

"Sorry about your son," a woman shouts to him over the thumping music.

Almost everyone wants a picture.

"He's tired of being stopped for photo shoots," says his wife Calvina, Michael Jr's stepmother. "We can't even go to the grocery store."

Brown's death - and the police response to those who protested the killing - kicked off a national dialogue about race, force, and responsibility in the US. Wilson, who has since left the force, was not indicted on any charge, and a Justice Department report found "no evidence" that he had shot at Brown while the teenager was running away or trying to surrender.