A weekly series, originally hosted by John Walsh, that is dedicated to the pursuit and capture of America's most dangerous criminals. John Walsh began his work pursuing dangerous criminals after the abduction and murder of his son Adam in 1985. The series profiles dangerous criminals with high-budget reproductions of the crimes they committed and ties in with a hotline viewers can use to give possible lead-in information. The series was briefly cancelled in 1996 by Fox but was revived after much petition from law enforcement officials. In 2011 Fox cancelled the series. Lifetime picked it up for a season in 2012 but cancelled it in 2013. The show was revived again in 2021 and returned to Fox where it was hosted by Elizabeth Vargas.