spoilers for pretty much the whole plot
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I can say with confidence that Twyla was the one who killed Reginald's roommate, just think about it for a second
warm hair has glasses, dressed very proper
the only people who fit this description are Reginald and Twyla currently
on the day of the incident, she told Reginald to be with gunter so she could get into the dorm and kill them without anyone seeing and also so she could blame it on Reginald probably
Reginald got a spare key made for mary so she could get into their dorm, but she lost her key before the incident
mary is dormmates with Twyla so if she didn't drop it or stuff Twyla could've very well have taken the key and that explains the "entered the dorm very easily" part when ollie spoke to the ghost
and also h ow the hell did she know where the murder weapon was when there's no way shed know because they locked the dorm for a long time