Hank Aaron, the legitimate career home run leader, passed away on January 22, 2021 at age 86.
Aaron was overshadowed early in his career by Willie Mays, Mickey Mantle, Roberto Clemente, and others, as he was quietly amassing his home run totals.
As those other stars faded (and Aaron approached the 500 home run mark) he came to the forefront, with only Willie McCovey and Frank Howard reaching similar seasonal home run totals.
Aaron was second to Harmon Killebrew for most home runs hit in the 1960s. See chart here