South Africa's leading euthanasia campaigner, Sean Davidson, has been freed on 20,000 rand ($1,357; £1,030) bail following his arrest on a murder charge.

Mr Davison, the founder of Dignity SA, was arrested over the death of medical doctor Anrich Burger in 2013.

Mr Burger had become a quadriplegic following a motor vehicle accident.

Mr Davison's colleague at Dignity SA, Willem Landman, told the BBC that he was kept overnight at a Cape Town police station.

Mr Landman said the elite police unit, known as the Hawks, had confiscated his computer and mobile phone.

“There’s clearly a distinction between this sort of assisted death and to kill someone with evil intent,” Mr Landman added.

Mr Davison made it clear that he would deny the murder charge.

His lawyer read an affidavit on his behalf in court in Cape Town.

“It is and always has been my intention that I have not committed any offence as alleged in this matter," the affidavit stated.

State prosecutor Megan Blows told the court that "new info has come to light", indicating that Mr Davison "might have committed other similar offences", local media reported.