Mathieu Vidal

In Je ne suis pas coupable, the France Télévisions adaptation of Sad Cypress for the TV series Les Petits Meurtres d'Agatha Christie, Mathieu Vidal is the fiance of Claire Laroche-Viseul and the parallel of Roddy Welman in the original novel.

Like Roderick, Mathieu meets and falls in love with Clémence Mouson, the parallel of Mary Gerrard. He breaks off his engagement with Claire, who takes it very badly, more badly than her parallel Elinor Carlisle. Mathieu plays a much more antagonistic role than Roderick. After Clémence is found murdered, he openly accuses Claire of being the killer. He denounces her and tells the police that after he broke off with Claire, there was a stormy argument, during which Claire almost threw a ceramic object at him and threatened to kill him and Clémence. Nurse Melle Thuleau who was outside the room heard this also and corroborated Mathieu's account. This led to Claire being arrested and ultimately put on trial for the murders of her mother Élisabeth Laroche-Viseul and Clémence.

Mathieu Vidal is portrayed by Lannick Gautry.