In Pursuit with John Walsh - Season 4 Episode 1
John is in pursuit of William Strand -- police say he killed his ex-girlfriend who was also the mother of his son. Later, Cal hunts for Leslie Lagrotta, a suspect accused of sexually assaulting women in central Florida for over a decade.
- Genre: Crime, Mystery, Documentary, Drama, Reality
- Studio: Investigation Discovery
- Keyword: sexual abuse, homicide, kidnapping, exploitation, investigation, murder, tragedy, criminal, true crime, missing child, childhood sexual abuse, child abduction
- Cast: John Walsh, Callahan Walsh
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