Adapter protein that associates with PIDD1 and the caspase CASP2 to form the PIDDosome, a complex that activates CASP2 and triggers apoptosis (PubMed:15073321, PubMed:16652156, PubMed:17159900, PubMed:17289572, PubMed:9044836). Also recruits CASP2 to the TNFR-1 signaling complex through its interaction with RIPK1 and TRADD and may play a role in the tumor necrosis factor-mediated signaling pathway (PubMed:8985253). {ECO:0000269|PubMed:15073321, ECO:0000269|PubMed:16652156, ECO:0000269|PubMed:17159900, ECO:0000269|PubMed:17289572, ECO:0000269|PubMed:8985253, ECO:0000269|PubMed:9044836}. This is the function of CRADD (CARD and death domain containing adaptor protein, Ensembl gene identifier ENSG00000169372).