As Congress investigates whether there was political motivation in the firings, the Times found cases in which the three attorneys balked at Washington requests to initiate death sentence trials.
In one of Chiara's Michigan cases, the state law against execution was overruled when the Justice Department made it a federal case based on the fact a firearm was used in a drug-related offense.
In Phoenix, Charlton repeatedly balked at filing capital murder charges in a case where the victim's body has not been recovered, the Times said.
Richard Dieter, executive director of the Death Penalty Information Center in Washington, said there have been 95 federal death penalty trials in the Bush administration, compared with 55 during eight years under the Clinton administration.
2014: The Year in Music [PHOTOS]