According to the record I found, Beniah Gill died in 1881.
Beniah H. Gill, died Oct. 5, 1881, Eastham, Mass. age 53 years, 1 month Cause of Death - Dropsy Born Eastham, Mass. son of Isaiah and Mary (Mass. Archives vital records index, Vol. 328, page 7)
Sarah married a second time, 10 years later:
Sarah A. Gill, 39, of Eastham, pants maker, b. Balitmore, Maryland, dau. of Isaac & Margaret, second marriage married June 2, 1891 in Harwich, Mass. to Elias H. Chase, 33, of Eastham, b. Dennis, Mass., son of Chas. H. & Rosanna, second marriage. Service performed by R. M. Wilkins, pastor of M.E. Church, Harwich. (Mass. Archies vital records index, Vol. 415, page 13)