reaching for this shoe and that his death was an accident. they know their child did not climb into a wrestling mat, get stuck and die. where s that video? reporter: the sheriff s office says that moment was not recorded. the johnsons also questioned moments in the surveillance video like this one. kendrick is seen running in the gym and then another image appears showing other students. it jumps from one moment to another. the johnsons attorney tell from the surveillance video what happened to kendrick and when the other students entered. we don t have any time code with which to synchronize the events that are shown in the video. either the camera did this on their own or a human being interacted to make this camera do these things. reporter: an attorney for the school tells cnn what we produced to the sheriff is a raw feed with no edits.
rolled up gym mat. his parents believe he was murdered. four cameras in the gym and more than 25 others on campus captured almost 300 hours of security footage. johnson s parents say someone tampered with some of the images. cnn had a video forensic analysis done to get some answers. here now is cnn s eric blackwell. that s my child and we re going to fight until it s all over. until we get the truth. that s all we ever asked for. what happened to kendrick johnss. jacqueline johnson and her husband hope to find the truth in the hundreds of hours of surveillance video recorded the day sheriff investigators say the 17-year-old died. look carefully. there she in the white t-shirt and jeans carrying a yellow folder. the johnsons have this at the result of a lawsuit. investigators in florida told the johnsons and authorities kendrick climbed into a gym mat