On April 26, 2017, Cpl. Stephen Ballard was murdered while making contact with a suspicious vehicle in a convenience store parking lot. Information quickly developed that the suspect had fled to his family's residence in Brick Mill Farms. Shortly thereafter, the Delaware State Police Special Operations Response Team responded to the suspect's residence, and was immediately ambushed with rapid rifle fire from the residence. This began a 20-hour standoff with the suspect, who was killed as he exited the residence continuing to fire at the police. This incident debrief will include the timeline, initial response, barricade operations, and post-incident review and investigation. It will detail lessons learned from all aspects, including patrol response, SORT response, multiple agency response and resources, command post operations, team fatigue, scene management, robot and UAS integration, and post-incident considerations.