Died between 1881 and 1891 (according to census records).
Probably Wrexham (or his birthplace in Ruthin).

Deaths Sep 1883   (96%)
ROBERTS  Thomas  58  Ruthin  11b 193

Deaths Mar 1885   (>99%)
Roberts  Thomas  60  Ruthin  11b 251

Deaths Dec 1886   (>99%)
ROBERTS  Thomas  63  Wrexham  11b 193

Deaths Jun 1888   (>99%)
ROBERTS  Thomas  64  Wrexham  11b 214   (best match)

Deaths Dec 1891   (>99%)
ROBERTS  Thomas  69  Wrexham  11b 232   
ROBERTS  Thomas  70  Ruthin  11b 243   
ROBERTS  Thomas  66  Wrexham  11b 199

Still alive in 1901

Not sure when Elizabeth died. Her last known address is Bersham, Wrexham.  If registered in Wrexham, then this is the most likely, but many other possible records past 1901. There was an Elizabeth Roberts in Wrexham with John and family, but this couldnt be her. 

Deaths Sep 1913   (>99%)
Roberts  Elizabeth  89  Wrexham  11b 330

NOTE: Bersham is a small village, yet Edward Eddows and family also lived here, so a possible connection.

Aged 35 in 1891 Wales Census
Born: Bersham, Denbighshire, Wales (1891 census)
Born: Cold Poeth, Denbighshire, Wales (1871 census)

Probate:
Brereton Mary Eleanor of 52 Salem-terrace Coedpoeth near Wrexham, Denbighshire widow died 2 March 1940. Probate Llandudno 17 March to Sarah Jane Roberst spinster. Effects £3,977 15s

Born: Cold Poeth, Minera, Denbighshire, Wales

Born: Cold Poeth, Minera, Denbighshire, Wales

Born Cold Poeth, Mineria, Denbighshire, Wales