After a scoreless first half, Kirby Zak had given the Bearkats a 1-0 lead with a goal in the 64th minute. Zak intercepted a clearing attempt by Lamar goalkeeper Jennifer Gibbs and rifled a shot into the net. The tally ended Gibbs' scoreless streak at a school record 333 minutes.
Lamar evened the match at 1-1 as Lisa Hance scored on a cornerkick from Grace Bowman in the 75th minute.
Both teams had a pair of shots in the first minute of sudden death overtime. In the second overtime period, Bos scored on a pass from Lisa Hance.
The victory upped the Cardinals' record to 7-5-1 overall and Lamar stays perfect, 4-0-0, in Southland Conference action. Sam Houston dropped to 5-9-1 for the year and 1-3 in league play. The overtime was Sam Houston's second match to go extra time. The Bearkats tied 0-0 with Louisiana Tech in their first overtime this season.
Tricia Mallory led the Bearkat offense with four shots including two that were saved.
Sam Houston continues their Southland Conference road swing Sunday afternoon with a 1 p.m. contest against McNeese State. Next home action for the Bearkats will be the make-up match with Central Arkansas on Wednesday at 7 p.m. at Joseph Pritchett Field.