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Executive Summary: For the past 25 years, the Border Patrol has tracked migrant deaths along the US-Mexico border. For nearly the same amount of time, it has also faced criticisms that it failed to capture the true number of migrant deaths in its tally. This article focuses on these undercounting criticisms and asks two questions: (1) How many documented migrant death cases are left out of Border Patrol's official data? And (2) what factors lead to the Border Patrol's migrant death undercounting? In particular, the article focuses on three South Texas counties: Brooks County, Kenedy County, and Maverick County. To answer the research questions, this article relies on comparative data analysis. In particular, it compares two person-level datasets: the Border Patrol's dataset on migrant deaths from 2009 to 2017 and county-level records from the Brooks County Sheriff's Office, the Kenedy County Sheriff's Office, and Maverick County Justices of the Peace over the same period. It then attempts to match each county-level record to a recorded death in the Border Patrol's dataset. Using this process, the article quantifies migrant death undercounting in South Texas, highlights geographic and temporal trends, and tracks the uncounted cases' specific characteristics. From 2009 to 2017, this comparative data analysis confirmed that the Border Patrol was undercounting migrant deaths across the three South Texas counties. Specifically, the article finds that the Border Patrol failed to include 139 cases, which totaled 19 percent of the counties' 749 recorded migrant deaths during the study period. This undercounting ranged from 16 percent in Brooks County to 24 percent in Maverick County and 29 percent in Kenedy County, with fluctuating rates over time. The uncounted cases also had specific characteristics. In particular, they were more likely to be skeletal remains, lack an identification, and be discovered by an external entity. These characteristics highlight the various factors behind the Border Patrol's undercounting, such as issues with the Border Patrol's migrant death definition, inconsistent data collection from external entities, and the agency's low prioritization of migrant death tracking. To address and remedy the Border Patrol's migrant death undercounting requires tackling each underlying factor. First and foremost, this article recommends that the Border Patrol fully train its agents on the agency's migrant death definition and ensure consistent and standardized outreach to external entities. Further, it recommends that the Border Patrol improve its migrant death count's accuracy through additional operational changes. These proposed changes include making "accurate migrant death counts" an official objective for the Border Patrol's Missing Migrant Program, prioritizing a two-way information-sharing process with county-level officials, retroactively including missed migrant deaths in the official count, and publishing more detailed person-level data on migrant deaths. [ABSTRACT FROM AUTHOR]