Each day at sundown, when the last tour boat departs from Alcatraz Island, one lonesome soul is left behind. He's the night watchman of...

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ALCATRAZ ISLAND, Calif. — Each day at sundown, when the last tour boat departs from Alcatraz Island, one lonesome soul is left behind. He’s the night watchman of Alcatraz.

Guided by the beam of his flashlight, Gregory Johnson inches down the gloomy infirmary ward of the island’s retired prison, once home to the nation’s most malicious killers and psychotic criminal malcontents.

“Hey, what’s that noise?” he asks, throwing the light against the half-open door of a solitary-confinement cell. He pauses, shrugging off another unexplained Alcatraz phenomenon.

“Man,” he whispers, “I couldn’t imagine being out here at night without my gun.”

Until the first boat arrives after dawn, the U.S. Park Police officer spends the night battling his nerves and imagination, patrolling the place once known as America’s Devil’s Island.

Over the years, Alcatraz was the last stop for 1,576 luckless hard-timers — murderers, mobsters, the nation’s most-wanted crooks — many of whom officials feared couldn’t be confined anywhere else.

Known as “The Rock,” the 12-acre penal island was notorious for its cramped cells and rigid discipline that at times demanded total silence. The prison also inflicted its own brand of emotional torture. At night, as the stories go, inmates could hear women’s laughter on the mainland 1 ½ miles away.

Decades after the prison closed on March 21, 1963, with inmate Frank Weatherman’s valediction, “Alcatraz was never no good for nobody,” all that remains is the lore of the desperate men once locked up here.

“I don’t believe in ghosts, per se,” said Johnson, 38, a no-nonsense law-enforcement veteran. Still, holding a ring of oversized keys, he cautiously makes his moonlit rounds across the island, some areas wanly illuminated by ancient light fixtures, others dark.

His footsteps echoing, he walks the old cellblocks that once housed notorious bank robber and gangster Arthur “Doc” Barker and kidnapper Alvin “Creepy Karpis” Karpavicz, formerly Public Enemy No. 1.

He checks the crumbling medical ward where Robert “the Birdman” Stroud spent 17 years. He peers into the deserted laundry room where Chicago mobster Al “Scarface” Capone hustled among the industrial washers.

“There’s no one out here”

Every now and then, the old prison plays tricks on his mind.

One night, as the buoy bells clanged and the foghorn moaned, he swore he heard clinking glasses, as if a toast were being made. He hears mice skitter on cellblock floors, and the wind howling outside often seems like crazy laughter.

“This is one creepy place after dark,” he said. “It can make the hair on the back of your neck stand up straight.”

For years, ferry-company employees were assigned to the island’s night shift. Last fall, when the National Park Service, which runs Alcatraz, changed ferry services, Park Police took over until the new contractor begins work this month.

Officers watch the ferry docks and federal facilities, mindful of protesters or pranksters on motorboats.

Johnson initially balked at the duty he shares with other officers. “I said, ‘You want me out there all by myself? Once you’re there, you can’t get off.’ “

At first, he tried to tame Alcatraz by absorbing its history. He took the park service’s audio tour, walking alone among the cellblocks, guided by the recorded voices of former guards and inmates.

Then he took a different tack: reveling in his fear.

Inside Capone’s old cell — No. 200 on the second tier of B block — he watched horror movies on his laptop, flinching at each murder.

He soon questioned that decision.

“I like to be scared, but not that scared,” he said.

“I had to remind myself, ‘There’s no one out here but me. So just put that stuff out of your mind.’ “

Between 1934-63, the Civil War-era military-fortress-turned-penitentiary provided many inmates with the hardest time they ever did, in part because San Francisco’s twinkling cityscape reminded them of the freedom they’d lost. Some found it too painful to even look at the skyline.

George DeVincenzi, a guard at Alcatraz from 1950-57, said the proximity of the California culture drove many prisoners nearly insane. “Yachts circled the island, and men on the third tier of C and B blocks could see girls in bikinis drinking cocktails,” he said.

Eight people were killed by inmates. One guard was slain in the prison’s laundry room in the late 1930s, and two others died during an attempted breakout by inmates in 1946. Five inmates were killed in random attacks. Five other prisoners committed suicide.

DeVincenzi witnessed a killing on his first day as a guard. He’d been assigned to the prison’s barbershop. Easy duty, he figured. Early in his shift, as he was watching an inmate shave another with a straight razor, all hell broke loose.

“The barber’s name was Freddie Lee Thomas, and suddenly he takes his shears and starts stabbing the man in the chair,” DeVincenzi recalled. “He’s slashing his neck and arms, and I’m blowing my whistle. Within moments, the man is dead, lying in a pool of blood. I guess the two were lovers.

“Freddie hands me the bloody shears. Then he leans over the body and kisses the dead man on the forehead. ‘Goodbye,’ he said. ‘I love you.’ “

“Overwhelmed by fear”

Years after the prison closed, the island’s sense of seclusion remains. Until the use of cellphones, night watchmen relied on a dated ship-to-shore phone to reach the mainland.

Erik Novencido worked the night shift for 10 years. The worst part was walking inside the electroshock therapy room. Once he took a picture at night to show friends. When he developed the film, he said, the snapshot showed a face in the room staring back at him.

He never figured out what it was.

“Sometimes I was just overwhelmed by fear,” he said.

Mary McClure, who spent 12 years working nights on Alcatraz until last fall, preferred the isolation. She couldn’t wait for the last tourist to leave. “It was the standard fantasy of being alone on an island,” she said. “Well, maybe not Alcatraz.”

Even so, there were strange events. “Many times, at night in the cell house, I had the distinct sensation of being pinched on the butt,” said McClure, 52, a former paramedic. “It happened with great regularity. I have no explanation for it, and I don’t talk to people about it, because I know it makes me sound crazy.”

Former inmate John Banner spent four years at Alcatraz in the 1950s. He recalls the squeal of the wind at night.

“Laying awake, listening to that wind, trying to hold on to what sanity I had left, I always thought of the brutality of that prison,” said the onetime bank robber, who lives in Arizona.

Banner, 83, can’t imagine facing Alcatraz alone, at night: “I don’t believe in spooks, but why on earth would a person want to do that?”

“They’re watching me”

When darkness comes, you don’t leave Alcatraz; you flee.

Amid a driving rain, a ranger hands Johnson the keys to the island and hurries toward a ferry that whisks away the last of the day’s 5,000 visitors.

Johnson stands amid the gathering seagulls. The big birds are everywhere, lined up on walls, circling like vultures.

They make him uneasy.

“It’s like they’re watching me, to see if I’m going to crack,” he said, “like in that Alfred Hitchcock film, ‘The Birds.’ “

He makes a sweep for any tourist stragglers and settles in for the night.

Johnson’s father was a prison guard in upstate New York. He has the job in his blood. But Alcatraz is different.

The last rays of sun now gone, the island fortress becomes the stuff of black-and-white 1950s crime photos. Johnson plays upbeat music on his iPod — Prince, Wham!, Michael Jackson — to lighten the gloom.

He earns overtime pay for his 18-hour shifts (3 p.m. to 9 a.m.), but sometimes, he said, “it seems like blood money.”

At 8 p.m., dressed in a black cap and windbreaker, his radio squawking with Park Police chatter, Johnson winds his way up a switchback as birds dive-bomb from ledges. In the rain, the cell house looms ahead like a haunted castle.

He walks cellblock rows nicknamed Broadway, Sunset Alley and Seedy Street. He enters a solitary cell, its heavy iron door creaking. The tiny quarters remain black even after his eyes grow accustomed to the space.

He stops at the cell of Frank Lee Morris, whose daring breakout was immortalized in the movie “Escape from Alcatraz.” Morris and two others left inside their cells dummy heads fashioned out of soap and toilet paper, complete with hair from the barbershop. The idea was to fool guards while the inmates left through holes chiseled in their cell walls.

Johnson looks at a model of one fake head left in the cell as a tourist display. He knows how the men felt: “Ten years here? I’d go crazy before that.”

By dawn, the night watchman is weary of The Rock. Passing the keys to a ranger, he makes his own escape from Alcatraz.