I've been reading various blogs surrounding this issue with interest. As far as I understand, the doctor had sectioned this man several times in the past against his will. However on this occasion, he had apparently escaped during a consultation.
The problem which Ireland now faces is that Ms Halappanavar's Convention rights under Articles 3 and 8 appear to have been breached, as well as her right to life. She was in a position of great vulnerability, yet she seems to have been treated deplorably.