Background: Impulsiveness is a psychological trait which is known to be linked to some axis Ⅰ and Ⅱ DSM-Ⅳ disorders.A recent review of the literature shows that the link between impulsiveness and suicidal behaviour is controversial.Using data from a psychological autopsy study among French national police forces, we described a series of 38 suicide completers in order to assess the role of impulsiveness and psychiatric comorbidities.Methods: All cases of completed suicide among French police national forces in 2008 were investigated (n=49).For each case three informants were interviewed: a member of the family or a close friend, a colleague and a supervisor.Data were collected using standardized questionnaires exploring socio-demographic characteristics, life events, social integration and support, health service use, mental health, occupational stress, impulsivity and aggressiveness.Impulsivity was measured using the 11th version of the Barratt Impulsiveness Scale (BIS-11).All these information were summarized in a time table life trajectories of all life areas.Each case was then appraised independently by at least two experts to conclude on the determinants of the suicide.Results: Among the 49 selected cases, 38 could be explored and analysed (78%).The mean BIS score was equal to 51.We defined two groups according to the impulsiveness score.The threshold was the median of the BIS score and was equal to 52.The two groups were compared: associations with aggressively, axis Ⅰ and Ⅱ DSM-Ⅳ disorders, socio-demographic data, personal suicide history, occupational stress and recent adverse life events were explored.Those with highest impulsiveness score were more likely to suffer from borderline personality disorder (p=0.002) and from psychopathic personality disorder (p=0.006).They were also more likely to have a high score of occupational stress (p=0.017).Discussion: Our study suggests that impulsiveness could play a role in suicide occurrence among persons with personality disorders, such as borderline and psychopathic disorders, and among those with high level of occupational stress.Case controls studies may be discuss to confirm those results.