Underhill replaces Randy O'Boyle, who was in the role for the club's first two seasons before resigning at the end of the 2012 season.
Underhill, 61, volunteered with the SeaWolves in a variety of roles this past season and has already started building key relationships in the Edmonds area with the team.
The SeaWolves are a member of the Northwest Division of the Premier Development League, the highest level of amateur soccer in the United States. The team plays its home games at Edmonds Stadium from late May through early August.
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