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In this March 20, 2013 image taken from video and provided by CBS, Charles Cullen speaks to “Sixty Minutes” correspondent Steve Kroft, not shown, at Trenton State Prison in Trenton, N.J. Cullen is serving consecutive life sentences for murdering as many as 40 patients during his sixteen years as a nurse. The interview airs on Sunday, April 21, on CBS. (AP Photo/CBS) MANDATORY CREDIT; NO SALES; NO ARCHIVE; FOR NORTH AMERICAN USE ONLY

Associated Press
In this March 20, 2013 image taken from video and provided by CBS, Charles Cullen speaks to “Sixty Minutes” correspondent Steve Kroft, not shown, at Trenton State Prison in Trenton, N.J. Cullen is serving consecutive life sentences for murdering as many as 40 patients during his sixteen years as a nurse. The interview airs on Sunday, April 21, on CBS. (AP Photo/CBS) MANDATORY CREDIT; NO SALES; NO ARCHIVE; FOR NORTH AMERICAN USE ONLY
In this March 20, 2013 image taken from video and provided by CBS, Charles Cullen speaks to “Sixty Minutes” correspondent Steve Kroft, not shown, at Trenton State Prison in Trenton, N.J. Cullen is serving consecutive life sentences for murdering as many as 40 patients during his sixteen years as a nurse. The interview airs on Sunday, April 21, on CBS. (AP Photo/CBS) MANDATORY CREDIT; NO SALES; NO ARCHIVE; FOR NORTH AMERICAN USE ONLY
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