In cases like the Oklahoma City and Boston Marathon bombings, he favored a greater willingness to change trial venues to overcome bias and impact of publicity.
The Biden administration, which announced a moratorium on federal executions, has pursued the case against Dzhokhar Tsarnaev, who helped carry out the 2013 bombings.
Unabomber Ted Kaczynski, 79, (pictured in 1996) was convicted in 1996 of killing three and injuring 23 people after mailing homemade bombs through the US Postal Service.