In this paper we present the design, implementation and preliminary evaluation of Re-Collision, a prototype collision reconstruction tabletop interface. Re-Collision was developed through a participatory design process involving expert users from the Calgary Police Forensics Team and Collision Reconstruction Team. We briefly cover fundamental domain characteristics emerging from interview sessions and explain how these informed the design of Re-Collision. The paper details our current prototype implementation and discusses results of a design critique conducted with domain experts using our system, helping us assess the potential of tabletop interfaces as aids in the process of collision reconstruction, as well as delineate and discuss relevant design implications. © 2012 ACM.