Purpose <p>Filicide theories have evolved from Resnick’s (1979) classification to more dynamic models that consider personal histories. Based on the idea that filicide stems from a complex interplay of stressful psychosocial events across life (Stroud, 2008), we propose another way to consider filicide focusing on psychological risk factors and mechanisms underlying the crime and their role in shaping life trajectories from birth until aggressive behavior against their child.</p> Method <p>Sixteen women who committed or attempted to commit filicide were interviewed in prison using the grid developed by Eloir et al. (2019). Four dimensions of their lives were explored: health, the carceral environment, adverse events, and social and affective relationships. All these elements were organized along a timeline representing the life trajectory of the person.</p> Results <p>Four types of trajectory were identified, highlighting riskier dimensions, namely the 1) continuous psychiatric dimension, 2) a temporary psychotic disorder at the time of the filicide, 3) continuous physical and psychological violence, and 4) a poor relational sphere.</p> Conclusion <p>Our results support the theory that complex constellations of multiple psychosocial stresses are present in the lives of filicide perpetrators and demonstrate the importance of understanding the filicide from a dynamic point of view in relation to the individual’s life trajectory.</p>