When a Minnesota state park employee is violently attacked while on duty, her killer becomes a persistent and elusive challenge for law enforcement. Despite abundant forensic evidence left at the crime scene, it takes a breakthrough in technology to finally bring the murderer to justice.

A Texas anesthesiologist, Raynaldo Riviera Ortiz, Jr., has been sentenced to 190 years in prison for poisoning patients by injecting heart-stopping poison into IV bags.

Ortiz was found guilty on multiple counts of tampering with consumer products and intentional adulteration of a drug.

Chief U.S. District Judge David Godbey equated Ortiz's actions to attempted murder, which U.S.

Attorney Leigha Simonton agreed with.

Victims and their families spoke during the sentencing about the pain and trauma caused by Ortiz's actions.

The evidence presented during the trial showed that patients suffered cardiac emergencies after new IV bags were hung at Surgicare North Dallas.

A 55-year-old tourist was attacked with a knife while walking on the sidewalk in a neighborhood on the Upper West Side of New York City.

The victim's left ear and left cheek were slashed during the random attack, and they were taken to a local hospital for treatment.

The suspect fled the scene, and the NYPD is actively investigating the incident.

This stabbing occurred following a series of other violent incidents in the city, including a deadly stabbing spree that resulted in three deaths.

The suspect in custody for those crimes had a history of arrests and had been recently released from jail.