Koch, 79, died after years of fighting various illnesses. Through the David H. Koch Foundation, he pledged or contributed more than $1 billion to philanthropic causes.
The managerial shifts are one piece of a push to heighten the digital experience for advisors and clients interested in the company's retirement options.
Financier and convicted pedophile Jeffrey Epstein was in jail awaiting trial on charges of conspiracy and trafficking minors for sex when he hanged himself.
Chris Flint announced his candidacy several weeks ago, saying he was running to ensure there would be more representation from firms directly offering clients financial advice.