There are numerous clues scattered throughout the room. Approach and investigate each one to make note of it.
Brain Enclosure - Search the dead Robobrain on the ground. The enclosure looks like it was smashed in.
Blood - Found to the West of the dead Robobrain. There is a small blood trail leading away.
Head to the Southwestern corner. You will find what could be the murder weapon. There is a baseball bat just to the left of the couch there. It could be the murder weapon. Talk with Maxwell to learn more.