The First 48 Presents Critical Minutes

In Memphis, Tenn., six people are murdered in the same house on Lester Street; a U.S. Navy veteran disappears in Tulsa, Okla.; in Atlanta, the brutal shooting of a young engaged couple on the side of the road haunts investigators.

In Tulsa, a key witness denies knowing anything about a brutal homicide until confronted with evidence that proves otherwise; in Dallas, a suspect shocks detectives with a confession they didn't see coming.

A confrontation turns deadly in Memphis, Tenn.; in Cincinnati, a single mother is torn between work and home; in Tulsa, Okla., a family dispute takes a dark turn; in Atlanta, an interrogation room interview turns emotional.

In New Orleans, a robbery takes a rookie months to unravel; in Phoenix a first-time detective with only one clue traces a random fender bender that sparks a horrible turn of events; in Atlanta, the new guy tracks the suspects in a drug deal.

In Tulsa, a shooting in a motel parking lot leads investigators to undertake an undercover operation to capture the suspect; in Tulsa, the investigation into the shooting of a former Marine leads to a dangerous car chase and apprehension.

A look back at three cases that erupted in the heat of the moment; a confrontation with a baseball bat escalates to murder; a man's visit with his ex-wife turns deadly; a woman watches in horror as her family is destroyed in a flash of violence.