Thanks for checking! I haven’t found much more. There is a Samuel Beer of Looe St Plymouth aged 40 who was buried at the Ford Park Cemetery, Plymouth on 28 October 1855. The other Samuel Beer who died in Plymouth in 1855 was buried in Ford Park Cemetery on 21 March 1855, of but was much older (b1787).
Also some supplementary evidence that Mary Beer who married Edward O’Roarke in 1860 in Plymouth Devon is likely the right one. One of the witnesses to the marriage, Edward W.S. Bickford, is likely Edward William Sampson Bickford b27 Dec 1839, baptised as Wesleyan Methodist on 10 March 1844 at Plymouth, son of William Bickford, a marine resident St Charles the Martyr and Elizabeth. His civil birth registration (q1 1840, Plymouth, vol 9, p.434) gives his mother’s maiden name as Roberts.
The address for Mary O’Roarke when Simeon Jennings paid his contribution for her assisted passage to NSW in 1879 was care of Mrs Robert’s, Stillman St Plymouth.
In 1861 Edward Bickford b1840 Plymouth a black and white smith is living with his widowed mother Elizabeth Bickford (b1820 Plymouth, laundress), Elizabeth’s mother Mary Roberts (widow aged 70, former laundress b Cornwall), her sister Emma Roberts aged 25 (unmarried dressmaker b Devon), her nephew Edward Pike (aged 5 b Plymouth) and lodger Nathaniel Pike (aged 26, butcher born Plymouth. The household is all living at Stillman St Plymouth.
In 1871 Edward Bickford b1840 Plymouth white smith (out of employment) is living with wife Jane Bickford b1842 Oreston Devon and their children Edward aged 5, William aged 3 and Phillipa aged 2. They are all living at Garden St Plymouth,