Charles Cullen interview with '60 Minutes' won't air Sunday

The show postponed airing the segment 'for at least a week" due to ongoing coverage of the Boston Marathon bombing suspects.

CBS announced Friday afternoon that an interview with serial killer nurse Charles Cullen will be held for at least a week due to ongoing coverage of the Boston Marathon explosions.

In an interview with CBS’ “60 Minutes” that was previewed online, Cullen at first says he thought he was helping people by ending their suffering. Many of the victims of his lethal drug overdoses were old or gravely ill.

But Cullen tells a different story when reminded some victims weren’t close to death. He says there was “no justification” and felt “overwhelmed at the time."