I don’t know how their crime locations site works—if they post based on crime reports filled out by deputies in the field or what. I haven’t found any news stories about any such homicide.
Noted - I have not looked for that, but it seemed odd that I hadn’t seen any such stories in the sidebars of the articles about the Guerena shooting. It also seems as though (except in reference to the Guerena shooting) the murder of the Guerenas’ relatives “went off the radar” very quickly. Granted that the Tuscon area is much larger (population-wise) than mine is, and I’m sure there are a lot more murders, but still, it seems so much more “worthy of attention”(?) than the usual “two guys in a bar get in a fight and one gets shot”... Maybe it’s due to that lack of local news organizations resources that you mentioned.