montano was homeless with a lengthy history of mental illness. his mother told police that her son was a diagnosed paranoid schizophrenic. motive unknown. >> so tragic. thank you so much for your reporting. back to politics, the first debate of the 2016 presidential race is tonight in case you hadn't heard. ten republicans gearing up for the debate. seven who did not make the cut will take part in the happy hour debate. we'll speak to one of the candidates, rick santorum, in a moment. and cnn's complete debate coverage begins with sara murray live in cleveland. how are preparations going, sara? >> reporter: good morning, alyson. things are starting to get underway here. the big debate is tonight as you pointed out. and candidates are trying to fit in the last-minute preparations, whether it means debate prep, a fund-raising event or working on the zingers. let's take a look at how they are getting ready. it's debate day, the biggest day in the campaign so far.