Over the suspicion of British MP Jo Cox murder, a 52-year-old man, Thomas Mair, has been arrested. He shot and stabbed the member of the parliament multiple times that claimed her life.

The armed forces arrested the man at a library in the Birstall town where he shot the MP thrice and stabbed her to death on Thursday. She died at the age of 41 later because of severe injuries. The murderer, according to the reports, had strong connections with the hard-right group based in London, which protested against British remaining in the European Union. The MP, who was also the mother of two, was a vocal humanitarian and showed full support to Britons stay into the European Union.

At the moment, the difference in opinion between the two people involved in the incident appears to be the main reason behind the murder. The picture is unclear yet, though. After gathering statements from the people who knew Mair, here are the 5 chilling facts shared about the murderer.

He remained quiet and was a loner

The neighbors have described him as a loner and quiet person. One of the neighbors, David Pickles, when asked about his views on the matter, he said Mair would have been “the last guy I would have thought of.” “He’s just quiet. He kept himself to himself. He lived by himself. He’s been on his own for about 20 years,” Pickles said as quoted by Mirror UK. “I’ve never seen a lot of people visiting or anything like that, but he likes gardening. He did a lot of people’s gardens round here. But he did it quietly.”

Mair’s mother’s friend, Mary, said that the murderer used to live in the library and was obsessed with books.

He suffered from mental issues

Mair’s brother, Scott, still refused to believe what happened. “I am struggling to believe what has happened,” Heavy.com quoted him as saying. “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.”

In 2010, Mair had a conversation with a local paper where he talked about his mental illness.

Gun used for Jo Cox murder was homemade

A café owner Clarke Rothwell, who was one of the witnesses of the incident, suspected the weapon to be homemade. He told the BBC that a “loud popping noise that sounded like a balloon burst – a loud balloon” was heard. “When I looked round there’s a man stood there in his 50s with a white baseball cap on and a jacket with a gun, an old fashioned looking gun in his hand.”

Mair’s half-brother belonged to mixed race

Media outlets have discovered that Jo Cox murderer has a half-brother Duane St. Louis from his mother’s second marriage to Reginald St. Louis. Mair, according to reports, had always been in an argument with his half-brother over politics.