san francisco firefighter robert muhammad had a family crisis in july 2021.won't discuss details out of respect for his privacy, but his colleagues were concerned about him. >> people offered to cook for him. people offered to work his shifts for free, and he rebuffed my offers. but i've never had a conflict with him prior to this. >> six months after that family crisis, firefighter gabriel shinn tells me, muhammad called to ask who in the firehouse was talking about his private business. >> robert, i said, i take i take ownership for speaking about that. and, you know, because we were concerned for you. but i'm not going to tell you who told me, and he said the next time he sees me, he's going to hurt me. he said that? yeah. well, i mean, he used he used a pejorative, but. yes. >> well, i'd like to know what he said. the next time i see you, i'm gonna you up. >> that's exactly what he said. >> court records show that two days after that phone call, robert muhammad used a computer at station 25 to retrieve shinn's work schedule. and his home address and left