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The mother of Steven Avery, the man who was at the centre of Netflix's Making a Murderer, has died aged 83.

Steven's attorney, Kathleen Zellner, confirmed his mother Dolores passed away on Thursday morning.

Her death comes just a day before Steven's 59th birthday.

Kathleen sent a message to followers of Steven asking for their support.

"He needs your support now more than ever," she said as she included an address where people could write to him in jail in Wisconsin.

Steven's brother Earl told TMZ that his mum had been in hospice care in the weeks before her death and said she had dementia.

He revealed that the last time his mum spoke to Steven was likely to be eight or nine months ago.

Dolores always maintained her son was innocent.

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