Regarding a possible civil lawsuit against the university, if there was evidence that the suspected murderer had a history of mental illness that was known and could have posed a danger to other students in the residence hall, including the res hall advisor, then this would be important information. The university would have to disclose this information in a civil lawsuit.
At our university, there is a Crisis Response Team and they meet every Monday morning to review details of student issues and determine if steps should be taken to actively address them, depending on their severity and danger to the individual student and/or other students and university personnel. The Crisis Response Team includes campus LE officer, Dean of Students, Director of the Counseling Center and other appropriate university administrators.