It almost never ends good when an innocent plays detective... Half the innocents seem to somehow die in the process.
Interestingly enough, that usually gives the official detectives something to do :)
Think of innocents as regular street cops, and detectives as.....detectives. As a cop/inno, it's your job to hunt for bodies and things killers have left lying about to refer the detectives to, while also hunting for the killer him/herself. It's nobodies faut but your own if you dont find something to as inno.