they say they've collected a massive amount of evidence from rex heuermann's cluttered home. heuermann is charged with murdering three women, and is suspected of killing a fourth. he has pleaded not guilty. and a new development tonight involving bryan kohberger, the man charged with killing those four university of idaho students. in a court filing, his lawyer indicates that kohberger may present an alibi, that he was somewhere else at the time of the killings last november. a plea of not guilty has been entered on his behalf. we'll turn to that dangerous heat now, expanding from the southwest to the central u.s., and heading for the east coast. 82 million people are under heat alerts, and those extreme temperatures are not only being felt on land, but this the water too. sam brock with an urgent rescue mission. >> reporter: tonight, florida burning up, by air and sea. an unfathomable 101-degree temperature reading just north of the florida keys, some of the warmest waters

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