Conversation so far:
Why did Peter Forsberg return to the NHL in 2011?
Peter Forsberg returned in 2011 to play with the Colorado Avalanche.
Was Peter Forsberg well received by the Colorado Avalanche?
Peter Forsberg won two Stanley Cups with the Colorado Avalanche.
What was the Colorado Avalanche?
The Colorado Avalanche are a professional ice hockey team based in Denver, Colorado.

Question: When did he retire?
Self-contained rewrite: When did Peter Forsberg retire?