Neighbors of James "Whitey" Bulger were oblivious to the fact that they lived next door to America’s most wanted fugitive.

“I just thought Charles and Carol were regular, retired people,” 88-year-old Catalina Schlank told RadarOnline.com.  “I had no idea that he was a crime boss, let alone Whitey Bulger.”

Whitey and his girlfriend Catherine Greig were living in a quiet residential area of Santa Monica, Ca, under the assumed names of Charles and Carol Gasko when they were apprehended by the FBI earlier this week.

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He was number two on the FBI’s Most Wanted List – right behind Osama bin Laden and after spending 16 years on the run the Boston-based mafia kingpin James “Whitey” Bulger was finally arrested.

“On the surface they just seemed normal. They walked in the neighborhood, I saw him pick up the newspaper and we see he and his wife at one of the local markets,” Schlank said.

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Bulger, who inspired aspects of Jack Nicholson’s character in the Oscar-winning 2006 film The Departed, was wanted in connection with 19 murders he’s tied to.

“When I heard he was wanted by the FBI I almost fell to the floor,” his neighbor said.  “I’m glad he’s been caught and now he can serve whatever time he has left for the crimes he’s committed.”

Catherine Greig, 60, was also apprehended and faces charges of harboring a fugitive.

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An FBI informant himself for two decades, Bulger disappeared in January 1995 after he was told an indictment was headed his way.

“It just goes to show you don't even know who your neighbors are,” Schlank said.

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A former Massachusetts neighbor of gangster James ‘Whitey’ Bulger and his girlfriend Catherine Greig has told RadarOnline.com: “It was common knowledge that they lived here and it appeared that they were not trying to hide.”

Bulger, 81, and Greig, 60, fled their quaint home in the beach town of Quincy in 1995 ahead of his federal racketeering and murder indictments.

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The legendary crime boss and his girlfriend were finally arrested 16 years later in Santa Monica where they had been living in a low key apartment building.

He was number two on the FBI’s Most Wanted List – right behind Osama bin Laden. (When bin Laden died, he became number 1).

After spending 16 years on the run, Boston-based mafia kingpin James "Whitey" Bulger will face a federal judge in a Los Angeles courtroom Thursday to face charges of murder, conspiracy to commit murder, narcotics distribution, extortion and money laundering, among others.

Bulger, who inspired aspects of Jack Nicholson's character in the Oscar-winning 2006 film The Departed, has appeared on the FBI's Ten Most Wanted list -- with a $2 million reward for key info -- in connection with 19 murders he's tied to.

The FBI said Bulger, who was allegedly the head of Boston's Winter Hill Gang, played a “role in numerous murders committed from the early 1970s through the mid-1980s in connection with his leadership of an organized crime group that allegedly controlled extortion, drug deals, and other illegal activities.”