Now streaming on Paramount Plus, criminal minds evolution.

All my years as a profiler I studied killers, but I never studied what a pandemic would do to them.

We started communicating to become better predators.

The deeper you dig.

These aren't just connected cases.

This is a serial killing network.

The darker it gets.

There isn't enough time.

It's not over.

We're just getting started.

Criminal minds evolution. Stream new episodes now. Exclusively on Paramount Plus.

You've been with us for the two decades that we've investigated the case of Kevin Cooper,

the California death row inmate who has always professed his innocence.

Tonight there are new developments that may help Cooper in his bid for freedom.

Our investigation began with letters from San Quentin Prison outside San Francisco.

I'm Kevin Cooper. I'm on death row.

He claimed he had been framed for the murder of four people.

It was a terrible home invasion in Chino Hills, California, one night in 1983.

Family of four with a young boy who was a overnight guest.

Authorities say more than one weapon was used in the brutal murders.

Four of them died.

One survived even though his throat had been cut.

...