Coleman said after delving into the history of Louisville, he felt led to address the subject.
"The very same neighborhoods where those red dots appear — where we are losing our sons and daughters — are those very same neighborhoods where we have limited opportunity in an overt way for over 100 years."
He also leaves office with a few regrets, including the unsolved murders of Crystal Rogers and Bardstown Police Officer Jason Ellis.
"I looked Jason Ellis' widow in the eye, and I looked one of her sons in the face," Coleman said. "'We won't stop remembering your father and we will bring you justice.'"
Rogers has been missing since July 2015.
"I have not successfully been able to tell Crystal Rogers' family where she is or what happened to her and that's a failure, and I own that," he said.
Coleman also takes responsibility for the spike in violent crime.
"When you sit in this chair, you should take the responsibility," he said. "I should be the one that's mitigating those. When I pack out and leave on the 20th, I'll carry a great deal of sadness with me that I didn't resolve those matters."
Coleman said he's confident the Louisville Metro Police Homicide Unit will solve the cases, but he hopes the community will be patient.
"We have some hard chargers in the homicide unit being led by Lt. Burbrink," said Coleman, referring to veteran LMPD Lt. Donnie Burbrink, who leads the homicide unit. "They're out there trying to work these cases, but they cannot do it in a vacuum."
US attorney in Kentucky shares accomplishments, regrets, hope as he prepares to leave his post
Resignation Letter of United States Attorney Russell Coleman
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