Maternal mortality remains a significant public health concern in Nairobi slums, despite recent improvements. A mixed-methods approach combining quantitative data from healthcare records and qualitative insights from focus group discussions was employed. During the study period, there was a statistically significant reduction in maternal mortality (p < 0.05) with an estimated risk ratio of 0.76 (95% CI: 0.62-0.93). Community health worker programmes effectively contributed to reducing maternal mortality rates, highlighting their importance for future public health interventions. Continuation and expansion of community-based healthcare services are recommended based on the observed effectiveness. maternal mortality, Nairobi slums, community health workers, longitudinal study The empirical specification follows $Y=\beta_0+\beta^\top X+\varepsilon$, and inference is reported with uncertainty-aware statistical criteria.