Lockup: State Prisons

Authorities investigate an inmate's demise. A convicted murderer explains the ways of prison, and a newly incarcerated inmate learns the ropes.

A special gang unit investigates a pair of cellmates. Inmates share their private thoughts from inside their own cells

A cell search leads to the discovery of a gang manifesto. An older inmate mentors a new prisoner,

A search for contraband turns up the heat on some inmates. A convict floods the prison, prompting an evacuation. A bank robber recounts his crimes.

A troublesome prisoner inspires a strong response from the guards. A predatory new inmate raises concerns among the staff.

An inmates suffers a self-inflicted wound, another is caught with a homemade cuff key, and an older inmate reflects on all he's lost.

Two inmates show off their tattoed eyes. After 19 years, a court order may give a longtime prisoner another chance.

After years behind bars, a man prepares to leave prison, following in the footsteps of his twin brother. A child visits his father in prison.

Angry inmates flood the prison's segregation unit, prompting a furious response. Another inmate nears the end of his sentence.

Corcoran prisoners struggle to accept past choices and make wise decisions that will help lead to their eventual release.

A violent attack at another California prison inspires Corcoran staff to put their own inmates on lockdown as a safety measure.

With drugs and weapons an increasing problem in prison, officers do their best to find the contraband before it's too late.

A new busload of inmates arrives in Corcoran, where they must quickly adjust to their dangerous new surroundings

Inmates explain the gang politics in Corcoran prison, while officers discuss the techniques they use to stay safe on the job.

Producers examine the volatile interactions between warring inmates and officers.

In Alabama's Holman Correctional Facility, where life sentences are common, inmates rarely have the opportunity to see freedom before they die.

In administrative segregation, Holman prison's most volatile inmates exist in solitary confinement for 23 hours every day.

When outside relationships cease to exist, prisoners sometimes look to each other to help ease the loneliness and despair.

In California's San Quentin prison, gangs, violence and boredom combine to create a dangerous mix for inmates and officers.

A 20-year-old inmate speaks about how he grew up on the streets and that motivates him to turn his life around.