Intelligence becomes embroiled in a violent robbery case that put Halstead in the line of fire.

The team finds themselves looking into a kidnapping at a hidden shelter for women.

A man and his son are shot to death, tearing their family apart.

A woman's death while hiking in the Rockies was initially ruled an accident

Stover had become known as Seattle's Dog Whisperer.

When a young woman is found dead in a field on the outskirts of Green Bay, Wis., a fitness tracker helps detectives solve the mystery.

Away from the action, new bonds form and old ones strengthen.

Firehouse 51 struggles in the wake of a recent tragedy .