College murder (2/5 stars)
It was the first day of college when a young girl was found dead at school.
The police narrowed down four suspects.
1. The Dean: He claims he was working in his office the whole day.
2. The Maths Teacher: She claims that she was giving her students grades.
3. The caretaker: He claims that he was bringing the mail.
4. Mathew: He claims he was cleaning the roof of the college.
Who is the murderer and why?