The Hunt with John Walsh

Authorities consider Alfonso "Poncho" Diaz-Juarez to be one of the most violent pimps to ever have trafficked women from Mexico to brothels in Texas. He is accused of kidnapping young women and bringing them into the U.S., where he tortured and raped them, and forced them into prostitution.

Authorities in Texas are searching for William Joseph Greer who confessed to having murdered his girlfriend Tammy Esquivel, a divorced stripper in 2006, but has managed to stay one step ahead of the law.

In 2012, 14-year-old Lucy had been communicating on Facebook with 30-year-old Salvadoran man Oscar Menjivar-Herrera. Lucy later confessed to Menjivar-Herrera raping her in her backyard with a 12-year-old boy standing by. Police located this boy, and realized that he was acting as a "cloak" for Menjivar-Herrera on a regular basis, having tagged along for other rapes.

A search for Jorge Rueda Landeros, who is wanted in connection with the 2010 murder of American University accounting professor Sue Ann Marcum.

A search for Elby Hars, who allegedly abused a young girl in Columbia, S.C.; a hunt for Eugene Palmer, who allegedly shot and killed his daughter-in-law.

Police hunt Robert William Fisher who is wanted for the 2001 murders of his wife Mary and their two children; police pursue Honolulu couple John and Julieanne Dimitrion who are wanted for mortgage fraud.

Authorities in Harris County, Texas are desperate to find Alfonso Diaz-Juarez, a convicted pimp, child molester and sexual predator, known for profiting from prostitution and sex trade trafficking.

A Texas woman, Jennifer Puente, is being sought in connection with the horrific and brutal murder of her best friend in 2012, and already her accomplice/boyfriend is serving 34 years for his part in the crime.