I just discovered that 1 Derby Road was first a workhouse, and then became "Wesham Park Hospital" (specialist geriatric and psychiatric). Since the cause of death is listed as "Senile myocarditis", I guess he was a patient there?
I was told by a family member that he had syphilis -- which probably brought on the senility. He split up with his wife in about 1900 in Scotland, and she moved to Canada with their children in 1911. Nobody seems to know what happend to Alexander after that.