Background: Sustainable approaches to improve quality and safety of care of patients with advanced cancer while concurrently reducing costs is a growing national need. As part of the Veterans Administration Engagement of Patients with Advanced Cancer (EPAC) trial, we trained a lay health worker (LHW) to engage patients with stage 3 and 4 cancer in early advance care planning (ACP). The goal of this follow-up study was to examine the effect of the LHW intervention on patient-reported care experiences, healthcare utilization, and costs in the last 30 days of life for patients who died within 15 months of enrollment. Methods: We evaluated patient-reported experiences with decision-making, healthcare utilization, and total healthcare costs 30 days prior to death. A T-test was used to compare patient experiences with decision-making. To compare ED use and hospitalizations, we utilized an exact Poisson regression. A generalized linear model with gamma link-log function was used to compare total costs. The latter methods adjusted for length of follow-up. Results: In the 30 days prior to death, 60 patients died in each arm within 15 months of enrollment (difference not statistically significant). Patients in the intervention had significantly improved rates of ACP documentation (98% versus 18% p < 0.001), improved experiences with decision-making as measured by an index ranging from 0-5 with higher values representing more favorable experience (4.73 (SD 0.61) vs 4.15 (SD 1.02)) p < 0.001), higher utilization of hospice (77% vs 52%, p < 0.005), lower rates of any emergency department use (5% versus 45% p < 0.001) and any hospitalization (5% versus 43% p < 0.001), and significantly lower total costs of care ($1,048 versus $23,482 p < 0.001) compared to the patients randomized to the usual care arm. Conclusions: Integrating a LHW into oncology care to engage patients in early advance care planning resulted in significantly improved patient experience, decreased utilization and decreased total costs in the last month of life. LHWs may represent a sustainable resource to facilitate optimal patient-centered cancer care at the end-of-life. Clinical trial information: NCT02966509