The First 48

A young mother and her best friend are gunned down in broad daylight.

In Atlanta, a young man and his pregnant fiancée are executed after a failed ransom attempt.

In Tulsa, Okla, a beloved grandfather is gunned down in his home.

A woman is shot in her hotel room; a music producer is found riddled with bullets in his apartment.

A young father is found dead in his home by his girlfriend; a Tulsa, Okla., teen is fatally shot.

A father of three is gunned down in front of his family during a deadly crime spree.

In Tulsa, Okla., a homeless man is beaten and stabbed to death.

Detectives find the naked body of an unknown homeless woman who was raped and strangled to death.

A woman is found dead behind an abandoned building; Atlanta detectives head to the Pocono Mountains.

In Tulsa, Okla., two brothers are shot down after checking on their night cleaning crew.

A father is gunned down in a parking lot; an elderly man dies in a suspicious fire.

A man comes home and is killed by a thief; a feud between gang members leads to a fateful encounter.

An abandoned truck leads Tulsa Homicide to several potential suspects in a fatal shooting case.

Detectives investigate the murder of a mother of two and unravel the deadly plot that took her life.

A young man is gunned down at a troubled apartment complex that comes under federal investigation.

After a father of three is gunned down at his job, the suspects end up in a standoff with police.

Tulsa, Okla., detectives work to track down an elusive driver that ran over a homeless man.

A teenager is shot dead, and detectives must uncover the truth among his roommates' stories.

After a young man is shot dead, detectives look to his friends and family to find his killer.

Detectives question whether a woman's death was a mistake or murder.

When two friends are found executed, the investigation leads detectives to an unlikely suspect.

When a shootout leaves a young man dead, the investigation leads to a woman from his past.

A mother is stabbed and detectives search for her missing son; two victims at the same complex.

A 23-year-old man is shot dead in front of his friends; a 15-year-old is found on the stairs.