Smyth, Jarret Stoll and Steve Staios scored in regulation for the Oilers, and Hejduk, Andrew Brunette and Jim Dowd countered for the Avalanche.
Jack Skille scored 11:13 into the third overtime to give Wisconsin a 1-0 victory over Cornell on Sunday night in the second-longest game in NCAA hockey tournament history.
Skille took a pass from Josh Engel from the point and beat goalie David McKee with a one-timer from close range to set off a wild celebration as Wisconsin advanced to the Frozen Four for the first time since 1992.
The Badgers (28-10-3) will face Maine on April 6 in Milwaukee, while Boston College and North Dakota will play in the other semifinal at the Bradley Center.
The game took 111 minutes, 13 seconds. Exactly six years ago, on March 26, 2000, St. Lawrence beat Boston University 3-2 in four overtimes in a game that lasted 123 minutes, 53 seconds.
McKee finished with 59 saves for Cornell (22-9-4). Wisconsin's Brian Elliott stopped 40 shots.
Elliott, who beat Bemidji State 4-0 in the first round on Saturday, was selected the most valuable player of the regional.
Maine 5, Michigan St. 4
John Hopson scored twice, Derek Damon had a goal and an assist and Greg Moore's empty-netter in the final minute ended up being the winner for Maine in the East Regional.
Maine (28-11-2), an at-large selection after losing to Boston College in the Hockey East semifinals, advanced to its 10th Frozen Four. The Black Bears have won two national titles, in 1993 and 1999.
Matt Duffy also scored and Ben Bishop made 33 saves for Maine, 1-4 in NCAA tournament play against Michigan State. Tim Crowder had two goals and Jim McKenzie and Drew Miller added goals for the Spartans (25-12-8).
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