Alexandra Anaya was 13 when she disappeared from her Hammond, Indiana home in the early morning hours of August 13, 2005. There were no signs of a struggle or forced entry. Three days later a boater found a young female’s torso wrapped in chains and weighed down with a concrete block in the Little Calumet River in Chicago; DNA later identified the remains as Alexandra’s. Her head, arms, and legs were never recovered.

Investigators tied suspicion to Rudolfo Heredia, the ex-boyfriend of Alexandra’s mother, Sandra Anaya, and father of Alexandra’s younger twin sisters. Sandra had ended the relationship after Alexandra disclosed years of sexual abuse by Heredia. He reportedly stalked Sandra, made a duplicate key to the home, and admitted during investigation to watching the family’s house; the location where the torso was found was only a few blocks from his residence. Heredia was arrested on federal interstate domestic violence and stalking charges related to harassment of Sandra but was acquitted in January 2006; he has not been charged in Alexandra’s murder.

Authorities say they believe Alexandra knew her killer and that the death was not random. The FBI later became involved and advanced forensic work has been sought; a reward of up to $20,000 is being offered for information leading to an arrest and conviction. Does anyone who knew Alexandra or lived in Hammond in 2005 have information that could help investigators?