u/Final-Isopod

I'm running one scenario now where players missed quite important step in investigation -. It revolves around dead body and since there are a lot of different leads to follow players missed the fact that they most definitely should do background research (aisde very basic info that was given on the very start) on the victim. They pushed forward trying to understand what is happening but not knowing around whom the whole thing is revolving they miss quite substantial part of information. On one hand it feels like if I would mention this I would be spoon feeding them with what they missed but it does feel that characters they are playing would know to check this (one of them is FBI special agent). I kinda hoped that they would review what they know so far and at some point they would pick this up but after two sessions in I'm not that sure anymore. How do you deal with player and character knowledge is such situations?