Joiner (2005) and colleagues (Van Orden et al., 2010) recently proposed the interpersonal-psychological theory of suicide, which posits that two interpersonal constructs are key causal factors in the development of desire for suicide (i.e., suicide ideation)—perceptions of burdensomeness on loved ones and/or society and feelings of not belonging to valued groups or relationships. They suggested that perceived burdensomeness and thwarted belongingness are mental states that are proximal causes of suicidal desire. This theory predicts that the simultaneous presence of feeling like a burden on others and feeling a thwarted sense of belongingness is associated with the development of the most serious form of suicide ideation.