A family wants answers after their uncle Mr Woods-Roberts died during a citizen's arrest. Relatives are demanding an investigation into the incident to determine whether their uncle's loss of life was a 'death in custody'.

11 Sep 2015 - 4:05 PM  UPDATED 11 Sep 2015 - 4:13 PM

A West Australian family has demanded answers after the death of their uncle, Mr Woods-Roberts, during a citizen's arrest in Perth.

The 35-year-old died after he was restrained outside a house in Lockridge on August 29.

According to media reports, a man returned to his home after 9pm to find two alleged intruders in his front yard.

Police said that one man fled while Mr Woods-Roberts was restrained and suffered cardiac arrest.

He was treated on the front lawn but later died in hospital.

“We believe 100 percent that this is a death in custody."

His niece, Adeline Roberts, told NITV News that her uncle has been publicly slandered without a proper investigation.

“There's no investigations that have been undertaken to establish that our uncle was indeed committing a crime at that address,” Ms Roberts said.

“We're just going on by what this man has said. The guy who's made the citizen’s arrest.”

She said that her mother, as next of kin, was not invited to identify the deceased and that cultural protocols were not observed before post-mortem procedures were begun.

“They've taken her up the driveway to the road to discuss things that I can't tell you about because they held me back from going to assist my mum who I know got hearing problems,” said Ms Roberts.

“They've also said to my mother that they have my uncle on the table already doing some sort of medical procedure. We've asked them if we can do a formal identification as per our cultural protocols and duty of care in looking after our family.

“We've asked them to refrain from any autopsies or medical examinations until we can do the claiming.”

Ms Roberts said the incident must be independently investigated as a death in custody.

“We believe 100 percent that this is a death in custody,” she said.

Calls have been made to the WA Police for comment and NITV News will continue to bring you more on this story next week.