Martina was a Dutch student.
Season 4[]
While learning english in one of her classes, Martina's teacher Mrs. Cahill asked her to say three sentences with a noun and verb in each one. Martina said she saw a man pedling his bicycle, her friend Klaus kissing Katrina, and then saw Katrina slap Klaus across the face. A phone began to ring in Cahill's ears and she thought it was another student's phone, but it turned out not to be ringing at all. Cahill rushed out the room and put Martina in charge.
When Martina went out the room to see what was wrong with her, she was horrified to see her teacher holding a gun aimed at her. After shouting her name several times, Cahill recited a saying in Dutch before putting the gun under her chin and killing herself in front of Martina.