The man charged with double attempted murder after a mother and daughter were 'smashed in the face' with a hammer battled with drug addiction and had been sectioned, his family has revealed.
Joe Xuereb, 27, of New Eltham, south east London, is accused of bludgeoning Ania Gos, 30, and her mother, 64, in the street on Sunday.
He was arrested later that day two miles away from the street where he and the victims live and has since been charged.
His brother Liam, 35, yesterday told of how he had smoked cannabis 'all his life' and had got 'lost in the system' after being sectioned in 2010.
Joe Xuereb, 27, of New Eltham (pictured left)) south east London, is accused of bludgeoning Ania Gos, 30 (right) and her mother, 64, in the street on Sunday
Police are pictured outside the home of Ania Gos in Adderley Gardens, New Eltham, London
He told The Sun: 'Joe got lost in the system. He was sectioned in 2010 and two years ago he wasn't well again.
'Cannabis f***** him up. He's smoked it all his life. If he doesn't take his tablets he's buggered but he's an adult so you can't force feed him. They don't come out and check on him regularly.'
Yesterday the first picture emerged of Ms Gos, an office worker, who also lived on Adderley Gardens, south east London - just three doors down from her attacker.
This is the first picture of Ania Gos left fighting for her life along with her Polish mother after her neighbour 'smashed them in the head' and left one's 'face hanging off'
Her partner Lukasz waited at her bedside in hospital as she underwent a six-hour operation. Her mother, who was visiting her from Poland, is due to in surgery on Monday.
The Oxleas NHS Trust, responsible for providing mental health services in New Eltham, did not want to comment on Mr Xuereb's health.
Ms Gos's sister yesterday told the Evening Standard: 'She is lovely. There is no reason for anyone to hurt her. My mother is in an even worse condition'.
Neighbour Robert Gover, 69, said Ania's mother had been due to return to their native Poland after a visit when the attack took place.
S&P Global, who Ania worked for, issued a statement expressing its 'deepest sympathies' to her family.
They said: 'We are extremely shocked and saddened by the senseless attack on one of our employees, Ania Gos, and her mother on Sunday afternoon.
'Our thoughts and deepest sympathies go out to their family and friends as Ania and her mother remain in critical condition.'
Scotland Yard confirmed they charged Xuereb in the early hours of Tuesday morning.
They had arrested him at 7.35pm on Sunday, roughly two miles from where the attack took place.
He had been spotted by a woman who then followed him in her car, until officers were able to detain him on Old Farm Avenue, Sidcup, south-east London.
A taser was 'deployed but not used' prior to his arrest, police said.
Officers were called at 12.10pm to find Ms Gos and her mother suffering from injuries 'consistent with a violent assault'.
Xuereb is said to have lived with his mother just three doors away from office-worker Ania and her sister
A blue front door of a two storey semi-detached house on the road appeared to have been battered numerous times with a blunt object
Retired TV engineer Mr Gover said Ania who 'worked in an office in Canary Wharf', had lived with her partner Lucasz in Adderley Gardens for the last couple of years
Retired TV engineer Mr Gover said Ania who 'worked in an office in Canary Wharf', had lived with her partner in Adderley Gardens for the last couple of years.
Mr Gover, who has lived on Adderley Gardens for 25 years, said: 'I just spoke to Lucasz and Ania had a six hour operation yesterday. The mother is in a really serious situation and having an operation today.
'I phoned the ambulance. I saw them covered in blood. I saw Ania laying down. I didn't know it was her at the time.
Forensic officers were still at the scene a day after the attack following the arrest of one of the victim's neighbours
Officers have investigated all around the property where the attack took place on Sunday
Police remain at the scene where a Ania Gos and her mother were attacked outside her home on Sunday
'I thought she was a passer-by. I did not recognise her. She has been living above me for a couple of years. They are a lovely couple. It is sheer shock.'
Mr Gover captured the shocking incident on his CCTV camera outside his home and handed police the footage yesterday.
He added: 'Her mum was visiting her from Poland with her sister and was due to go back that day.
'Ania's sister has a four-year-boy. They hushed him out the way and he was ushered upstairs by the sister's partner.'
Detectives have charges Joe Xuereb (pictured) on suspicion of two counts of attempted murder following the attack
Lucasz declined to comment. He asked if his privacy could be respected at this time and is back at the flat with Ania's sister her husband, and their son.
Police believe a hammer recovered from the scene 'may have been used' to carry out the 'horrific attack'.
A blue front door of a two storey semi-detached house on the road appeared to have been battered numerous times with a blunt object.
Detectives were seen yesterday searching the suspect's home, which is in the same street where the attack took place.