This is literally how most murder cases get solved (of the few that get solved)

[Prairie Gates]

The myth of the genius homicide investigator is nice for novels and teevee shows, but is generally fiction. Most homicides are either so obvious that they require little investigation, or are solved by a specific tip like "I saw a guy get into a car that had this plate." Or, "I heard Janelle's cousin did it." Or, "Can the DA give me a break on this GTA if I tell you something I heard about that shooting in Englewood last Tuesday?" Granted, the tip used to be called in rather than posted for clout on Reddit, but the point remains the same.