Red Wings defenseman Nicklas Lidstrom will announce his retirement after 20 NHL seasons with the Wings at a press conference Thursday afternoon, a source told ESPN.com on Wednesday afternoon. "He's going to announce tomorrow his decision for next year. I'll let Nick, he's played 20 years, he can make his own announcement," Detroit GM Ken Holland told reporters after the GMs met in New York before Game 1 of the Stanley Cup final.