Luigi Mangione's defense is ramping up its fight against the death penalty early in a federal case in the alleged assassination of UnitedHealthcare CEO Brian Thompson.

Luigi Mangione, the man accused of gunning down UnitedHealthcare CEO Brian Thompson outside a Manhattan hotel in December, has been indicted in a New York court on four charges including a count eligible for the death penalty.

A former corporate lawyer at two large U.S. law firms pleaded guilty on Wednesday to charges stemming from his failure to pay federal income taxes. Donald Trump's sentencing for his conviction on criminal charges stemming from hush money paid to a porn star was delayed on Tuesday until Sept. 18, less than seven weeks before the U.S. election.