Initiative personnel Nilken has been convinced of murder but it may be a mistake. Investigate all the details to discern the truth.
You can start this quest by talking to Mariette on Nexus - Operations.
First Murderer
Related points of interest
Mariette
Nexus / Hyperion
Chief Reynolds' leg bracer
Eos
Chief Reynolds' helmet
Eos
Chief Reynolds' chest piece
Eos
Chief Reynolds' armor scraps
Eos
Chief Reynolds' omni-tool
Eos
Mission objectives of First Murderer
1. Speak with the distraught turian
To start this mission you need to tak to Mariette.
2. Speak with the prison guard
3. Speak with Kandros
4. Optional: Playback recording
5. Speak with witness Shaw
6. Speak with Tann
7. Investigate murder evidence
Now you need to go to the surface of Eos, then find and scan a few pieces of evidence.
Murder evidence #1 - Leg bracer
Murder evidence #2 - Helmet
Murder evidence #3 - Chest piece
Murder evidence #4 - Additional armor scraps
The last piece of evidence is inside the nearby cave - it's Chief Reynolds' omni-tool.
8. Examine omni-tool
Examine the Chief Reynolds' omni-tool.
9. Confront Nilken
10. Speak with Tann
At the end you will have to choose between "Exile him." or "Release him."