On Tonight

After a successful young doctor collapses, a blood test reveals cyanide poisoning, resulting in a criminal investigation.

Authorities work to establish why a loving mother was brutally stabbed to death in her home.

Lockhart/Gardner represents a drilling contractor in an oil dispute, and election results are in.

Lockhart/Gardner works a case against Patti Nyholm, then winds up representing her.

Horatio tries to protect a mixed martial arts fighter.

A college student is found dead at the campus pool.

The trophy wife of a recently released prison inmate (Joel Grey) is murdered.

The murder of a woman puts her recently-paroled son in the hot seat.

When a gang from El Salvador infiltrates Chicago, intelligence works with a visiting detective to put an end to the crew's brutal tactics.

Intelligence investigates the death of a college athlete killed after kneeling in protest.