Alex Murdaugh, a prominent South Carolina attorney, is on trial for the double murder of his wife and son. On Wednesday, prosecutors are expected to present footage in court that could contradict Murdaugh's claim of innocence. Lt. David Britton Dove was called to testify and extracted forensics from the phones of Murdaugh and his family. The footage is a key piece of evidence in the trial, which is being prosecuted by the South Carolina Attorney General's Office.