The Revivant AutoPulse(TM) is currently being used by emergency personnel in the San Francisco Bay Area and regions of Florida, Virginia, and Ohio. The AutoPulse(TM) is a reusable, portable, automated chest compression device. It requires the technician to align the patient on the device, attach the latex-free plastic strip around the patient's chest, and then press start, causing the compressions to begin. The primary benefit of this device is its delivery of consistent cardiovascular compressions and improved cardiac output throughout its use during resuscitation. The three cases presented show how features of the design and operation of the AutoPulse(TM) may create physical marks on the body that suggest death-related injuries. In the first case, the rough horizontal anterior-inferior edge of the Velcro-like chest belt corresponded to the horizontal abrasion on the upper abdomen of the decedent. Symmetrical paravertebral hemorrhages were present only in the first case, in which manual and assisted CPR were both performed. The source of these hemorrhages appeared to be associated with the use of the automated chest compression device after manual CPR had been initiated. In the other two cases, the authors concluded that the lateral and anterior abrasions on the chests of the decedents corresponded in size and location to the chest belt of the AutoPulse(TM), and the anterior rib fractures were due to manual CPR. It is imperative that those who perform autopsies and conduct medicolegal investigations be aware of this new technology and its use in cardiopulmonary resuscitation. 1 table, 5 figures, and 10 references