The Justice Department announced Thursday that it has ended a lengthy investigation into the CIA's interrogation and treatment of prisoners without bringing any criminal charges. 

U.S. Attorney General Eric Holder announced the investigation into the deaths of two suspected terrorists  who died in CIA custody -- one in Iraq and another in Afghanistan -- was ended without charges because "the admissible evidence would not be sufficient to obtain and sustain a conviction beyond a reasonable doubt." 

The two cases include the highly publicized case of Manadel al-Jamadi, who died in a shower stall at the infamous Abu Ghraib prison in Iraq while in CIA custody.  Several U.S. soldiers, who were photographed with al-Jamadi's body, packed in ice inside a body bag, were later prosecuted and convicted in military courts for prisoner abuse. 

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The investigation spanned more than four years. It began with an investigation into the CIA's destruction of videotapes of aggressive interrogations of terrorist suspects, but was later expanded to include the deaths of the two detainees. 

In all the Justice Department investigated the treatment of 101 detainees who been held in U.S. custody since 9/11. 

CIA Director David Petraeus issued a statement thanking everyone at the CIA who supported the Justice Departments investigations.  

In an apparent effort to put the incidents and investigations to rest, Petraeus added, "As intelligence officers our inclination of course is to look ahead to the challenges of the future rather than backwards at those of the past."

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Lynndie England, who became the face of U.S. military abuses overseas for her role in the Abu Ghraib scandal, says she doesn’t feel bad for detainees who were subjected to torture.

“Their lives are better. They got the better end of the deal,” England told The Daily, a news publication for the iPad, from her home in Fort Ashby, W. Va. “They weren’t innocent. They’re trying to kill us, and you want me to apologize to them? It’s like saying sorry to the enemy.”

England was sentenced to three years behind bars for her role in the abuse scandal.

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She appeared in several of the best-known photos taken by U.S. guards at Abu Ghraib, including one image in which she held a naked prisoner on a leash; in others, she posed with a pyramid of naked detainees and pointed at one man’s genitals while a cigarette hung from the corner of her mouth.

At her trial, England said she appeared in the photos at the behest of Pvt. Charles Graner Jr., who she said took advantage of her love and trust while they were deployed in Iraq.

According to the Daily, England lives with her parents, is unemployed, has suffered from PTSD symptoms and is haunted by her past. She told the news publication that Graner has refused to acknowledge their 7-year-old son, even though his paternity was proved in 2009.

The 29-year-old added that she was troubled by the fear that her actions may have caused the death of members of the U.S. military. "That’s something that falls on my head,” she told The Daily. “I think about it all the time — indirect deaths that were my fault. Losing people on our side because of me coming out on a picture.”

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The Associated Press contributed to this report.