A man calls 911 claiming he found his ex-girlfriend dead, but his behavior on the call leads police to wonder if he could be involved. Investigators tirelessly gather evidence to convict a killer whose unchecked rage left a young son motherless.

When a young mother is shot dead in front of her son, horrified witnesses call 911 and describe the shooter as a slender man who disappeared into nearby trees. Though clues are scarce, investigators finally uncover the killer's shocking identity.

A woman calls 911, saying she's found her son unconscious in his home. When police arrive, they realize he's dead: his hands are bound and he's been strangled. At first it seems like a burglary gone bad, but cops soon discover this death was personal.

With the help of a neighbor, an injured woman calls 911 saying an intruder broke into her boyfriend's home and shot them both. Police respond to find the boyfriend executed, and soon they must decipher strange evidence left behind to identify the killer.

A dying man calls 911 saying he's been shot in the heart, and his son has also been shot dead. The shooter escapes into the darkness, and as detectives investigate, they navigate a complex group of suspects to uncover a tangled web of rage and revenge.

When two girls from neighboring counties disappear and are found murdered, one family receives multiple taunting calls from the kidnapper. Investigators work to track him down and succeed when they discover a clue delivered by the killer himself.

A terrified neighbor calls 911 when she witnesses a young mother gunned down in her driveway. The police work to uncover a complex conspiracy that ripped the loving mother from her three children, just to keep dark secrets hidden.

A frantic woman calls 911 when she finds her husband shot to death. The investigation reveals allegations of harassment from the victim's ex-lover and eventually uncovers a complex trail of deceit in a murder that was years in the making.

A woman calls 911, whispering that intruders broke into her home, bound her and her son, and attacked her husband. When police arrive to find the husband dead and the killers gone, investigators struggle to expose the twisted mastermind behind the crime.

A frantic woman calls 911 saying an intruder just entered her home and shot her husband. When the victim -- a local fire chief -- dies from his injuries, the first responder community works tirelessly to find out who killed one of their own.

A traumatized man calls 911 after seeing his friend shot and killed right before his eyes. With a surprisingly long list of suspects, investigators must sort through layers of lies, jealousy and mistrust until they finally uncover the shooter.

A woman calls 911 saying her husband is exchanging gunfire with intruders, and her toddler is outside with them. Police find the boy safe, though the husband is dead and a ranch hand injured. The search for suspects unearths a plot rooted in betrayal.