(Hillsboro, OR)  --  A Washington County sheriff's deputy will retire, following a plea agreement that includes a harassment conviction.  The sheriff's office says former Deputy David Bergquist was one of several deputies investigated for misconduct regarding an anonymous email that was sent to the agency last year.  Authorities say the investigation also showed Bergquist had engaged in inappropriate conduct while off duty.  The plea deal will also require Bergquist to complete 18 months of probation and 24 hours of community service, plus relinquish his police certifications.