Social Network Analysis (SNA) has proven to be an extremely useful and powerful tool for studying decentralized illicit networks. Given the myriad of metrics in the SNA toolbox, the methodology has the power to uncover nuances that most other methodologies simply cannot. One such metric is multiplexity, which measures the presence of more than one type of distinct tie (e.g., kin, neighbors, coworkers, etc.) between individuals. Studying multiplexity can provide valuable insights into how networks are structured and how they evolve, and evidence suggests that multiplexity often acts as the glue that holds networks together. Measuring multiplexity in Malaysian terrorist Noordin Mohammad Top’s terrorist network illustrates how his network operated, evolved, and ultimately collapsed following his death during a police raid on September 17, 2009. The information gained using these methods is critical for informing current and future efforts to effectively and efficiently dismantle illicit networks by identifying key actors and critical relationships.