Conversation so far:
What is the Portland Trail Blazers
The Portland Trail Blazers, commonly known as the Blazers, are an American professional basketball team based in Portland, Oregon.
When did Bill Walton join the Portland Trailblazers ?
Walton was the number one overall pick by the NBA's Portland Trail Blazers in the 1974 NBA draft. Walton signed with the Trail Blazers.
Against whom did Bill Walton play while with the Trailblazers?
In the 1977 postseason, Walton led #3 seed Portland to series victories over the Chicago Bulls with Artis Gilmore and the Denver Nuggets with Dan Issel.
Did Bill Walton have any notable wins ?
In a 4-0 series sweep of the Los Angeles Lakers in the 1977 Western Conference finals, Walton averaged 19.3 points, 14.8 rebounds, 5.8 assists and 2.3 blocks.
What did Bill Walton do after the Trailblazers ?
After several players on the Celtics said they liked the idea of having Walton as a teammate backing up Robert Parish and Kevin McHale, Red Auerbach made the deal happen.

Question: When did he leave the Trailblazers ?
Self-contained rewrite: When did Bill Walton leave the Trailblazers ?