The suspect has been described as quiet, polite and reserved, little known beyond the Yorkshire estate on which he lived.
His neighbours, who spoke to the Guardian, say Mair was quiet and polite, volunteering to do their gardens and offering horticultural tips.
It is believed he had mental health problems. In 2010, he was quoted by the local newspaper saying he had begun volunteering after attending Pathways Day Centre for adults with mental health problems.
“I can honestly say it has done me more good than all the psychotherapy and medication in the world,” he said.
“Many people who suffer from mental illness are socially isolated and disconnected from society, feelings of worthlessness are also common, mainly caused by long-term unemployment.”
Mair’s half brother, Duane St Louis, who is mixed race, says he had volunteered at a school for children with disabilities for several years and never expressed any racist views.
St Louis described his brother as a devoted son who shopped for their mother twice a week, the Guardian reports.
Talking outside his house in Dewsbury on Thursday, St Louis said he did not know of his brother having any strong political views, and did not know how he got hold of a gun.
Mair’s other brother, Scott Mair, told reporters he wept when he heard about the killing.
“I am struggling to believe what has happened. My brother is not violent and is not all that political. I don’t even know who he votes for. He has a history of mental illness, but he has had help,” he said.
TAP – Tommy Mair is innocent.