Members of the Celtics wore black warmup shirts with Havlicek's No. 17, which was retired in October 1978, on the front. The team then conducted a moment of silence with pictures of Havlicek on the jumbotron.
During the contest's first media timeout, the Celtics played a two-minute highlight video of Havlicek's storied career, which generated a standing ovation from the TD Garden crowd.
"We feel lucky to celebrate John Havlicek."
Havlicek played 16 seasons with the Celtics and is the franchise's leading scorer. He was a 13-time All-Star selection, five-time NBA All-Defensive first-team choice and four-time All-NBA first-team member.
Havlicek won eight championships with the Celtics and was inducted into the Pro Basketball Hall of Fame in 1984.
The Bucks led the Celtics 95-87 at the end of the third quarter in Game 3. The series is tied 1-1.