Bill Russell, Jaylen Brown and Magic Johnson took to Twitter to react to the sad news that Boston Celtics legend Tommy Heinsohn passed away on Tuesday.

Heinsohn is such an icon for the Celtics that he was inducted into the Hall of Fame as a player and coach.

2020 continues to be an awful year. The NBA community has lost David Stern, Kobe Bryant, Wes Unseld and now Tommy Heinsohn.

Celtics basketball on NBC Sports Boston won't be the same without Heinsohn, who was such a colorful and passionate analyst. Look for the C's to honor Heinsohn in someway once the 2020-21 season starts on Dec. 22.

Your resume speaks for itself when you can say you are a Hall of Fame player and coach. Heinsohn starred for the Celtics as a player from 1956 to 1965, winning eight championships and the Rookie of the Year award in 1957.

After his playing career finished, Heinsohn became a superstar head coach in Boston. He won two titles as a coach and has the second-most wins in Celtics franchise history with 427. Heinsohn was inducted into the Hall of Fame as a player in 1986 and then as a coach in 2015.

It's going to take Celtics nation and the NBA world as a whole a while to get over the Heinsohn news.