Who is Mr. Kirwin and how does he treat Victor? What has happened to cause Victor's arrest? What happens to Victor after his arrest?

Mr. Kirwin is the magistrate. Victor is arrested for Henry Clerval's murder. After his arrest, Victor becomes crazy with guilt and sorrow, and he falls ill with delirium and fever. Mr. Kirwin is kind to Victor, provides a doctor, and provides him with a room as well.