Hill's claims have been both disputed and embraced. While official sources have considered her an unreliable witness for a number of reasons, other researchers investigating the assassination and the conclusions of the Warren Commission consider her a highly credible witness. Critics point to her statement that she saw Jack Ruby, the killer of assassin Lee Harvey Oswald, at the scene of the assassination in Dealey Plaza when other witnesses placed him in the offices of "The Dallas Morning News" at the time. Others point to significant circumstantial evidence of an apparent smear campaign to undermine the testimony and credibility of Hill, the closest civilian witness to the assassination and its immediate aftermath.