Do you mean the entrepreneur who killed the angel investor, or the fire chief who sprayed a homeless man (the last in a series) and the homeless man fought back in self-defense?
The (former) fire chief Carmignani allegedly, probably, bear maced homeless previous previously. That is a separate crime. But the day the assault happened, April 5th, there's no evidence that the homeless man, Doty, was bear maced. The video footage shows Carmignani confronting Doty, Doty putting up his blanket like he thinks Carmignani is going to bear mace him (maybe he did in the past), and Carmignani confronting Doty as Doty is backing up out of the street. Then we have footage of Doty cornering Carmignani with a crowbar (not self defense), and then running and chasing after Carmignani hitting him with a crowbar (not self defense). There is a high chance that Carmignani could've died from being crowbar'd to the head.
I have lived in SF for close to a decade, and the only thing that has really changed is the amount of politically-charged media coverage the city receives.