None of his victims were in court Tuesday.
Authorities say that Purinton verbally harassed Kuchibhotla and his Indian co-worker, Alok Madasani, yelling "Get out of my country" at them before opening fire in Austins Bar and Grill in Olathe, Kansas.
'If you could have kept your anger inside and spoke to my husband softly, Srinu would have been more than happy to share his background and help you understand that not every brown skinned person is suspicious or evil, but kind, smart and contributing to America.
".(U) se the time that is being given to you to educate yourself and inform others who are still out in the open and stop them from killing innocent people as you did - choosing violence over kindness", she added.
He said he fired on the two men, who worked as engineers at GPS-maker Garmin, thinking they were Iranian.
Before the shooting, Purinton called Kuchibhotla a "terrorist" and shouted "get out of my country!"
Grillot told Purinton he needed to leave and escorted him out of the bar.
"The defendant acted with clear premeditation in murdering one man, and attempting to murder a second man, simply due to their race, religion, and national origin", Sessions said.
A third man who tried to intervene, Ian Grillot, also was wounded. He was kicked out of the bar for the derogatory comments but returned a short time later, spraying bullets from a 9mm and hitting Kuchibhotla at least four times.
Both Madasani and Grillot survived the violent attack.
After the shooting, Purinton drove 70 miles to Clinton, Missouri, where he confessed the shooting to a bartender at a restaurant. He has already been convicted of murder in Johnson County district court, receiving a life sentence there. Prosecutors agreed not to seek a death sentence as part of the plea agreement.
"No matter who you are, what you believe, or how you worship, you should be able to live without fear of becoming a victim of hate crimes".
Purinton previously pleaded guilty to state charges for murder and attempted murder and was sentenced to life in state prison.
In pleading guilty to hate crime and firearm offenses, Purinton admitted that he targeted and shot the two Indian men due to their race, color and national origin.
On Tuesday, the federal court handed Purinton a further three consecutive life sentences. "We hope today's sentencing brings some closure for the victims and their families", said U.S. Attorney Stephen McAllister for the District of Kansas.
Adam Purinton is seen in court in May.