A string of murders targeting a pizza chain and its employees leads to a nationwide manhunt for a killer bent on revenge.

A biochemist’s obsession with a coworker was exposed after a lovers' spat in a hospital parking lot.

Celebrity real-estate broker Linda Stein served New York's elite. When she was found dead, investigators faced a slew of powerful potential suspects.

An assistant biology professor at the University of Alabama in Huntsville shot and killed three colleagues and wounded three others during a faculty meeting.

A prominent cancer researcher was hospitalized for apparent poisoning after his coworker-turned-lover, a renowned breast cancer researcher, spiked his coffee.

When three hotel workers didn't turn up for their shifts, a bizarre series of discoveries reveals a workplace love triangle.

When entrepreneurial spirit turned two best friends into mortal enemies, one woman ended up on the run.

Shortly after taking a new job, a beloved horse trainer is found murdered in a rural stable in a small seaside English town.

When a mattress factory manager is found gunned down in the shower, investigators must find out if he was betrayed by a disgruntled worker.

An executive, who had come into the office on a Saturday to catch up on work, was strangled to death by a coworker who wasn't supposed to be in the building.