Yes, I do have a copy of Henry Moores Birkett's death certificate. He died 4 November 1897 at 637 Macon St., Brooklyn, of endocarditis. The record is Coroner's Certificate of Death No. 17890, Department of Health of the City of Brooklyn; it was signed by the coroner, George H. Mason. Henry Birkett was buried in the family plot in Cypress Hills Cemetery.
I do have some photos of the Birketts. I'll scan them and forward them to you.