When cells kill themselves, they usually do so by activating mechanisms that have evolved specifically for that purpose. These mechanisms, which are broadly conserved throughout the metazoa, involve two processes: activation in the cytosol of latent cysteine proteases (termed caspases), and disruption of mitochondrial functions. These processes are linked in a number of different ways. While active caspases can cleave proteins in the mitochondrial outer membrane, and cleave and thereby activate certain pro-apoptotic members of the Bcl-2 family, proteins released from the mitochondria can trigger caspase activation and antagonise IAP family proteins. This review will focus on the pro-apoptotic molecules that are released from the mitochondria of cells endeavouring to kill themselves. This article is part of a Special Issue entitled Mitochondria: the deadly organelle. ► Proteins are released from mitochondria during apoptosis. ► Several of these proteins can bind to IAPs, but they do not appear to be important regulators of cell death. ► During apoptosis, cytochrome c released from mitochondria is essential for activation of Apaf-1, which in turn activates caspases. ► AIF and endoG are released from mitochondria during apoptosis, but this is neither sufficient nor required for cell death.