UPDATED 8.43PM: Witnesses in the Coroner's inquest into the death of a young Indian security guard have pointed the finger at the man acquitted of his murder.

Vaughan Henare-Vaihu and Allen Ulugia have given evidence, at an inquest into Charanpreet Dhaliwal's death.

They told police the 22 year old was hit over the head by a piece of timber.

Mr Dhaliwal was killed while patrolling a west Auckland construction site in 2011.

Both witnesses have told the court they saw the man hit the security guard with a piece of wood.

A lawyer for the aquitted man suggested the wood has been thrown, to scare Mr Dhaliwal.

Sergeant Free says the witness told police he was with a group hiding at the site, after an earlier altercation with a nightclub bouncer.

"They were confronted by a security guard who was sitting in his car on the site..he asked them to leave..stated he heard a whack but was not looking at the time. The security guard was on the ground."

The witness told police he saw his friend standing over the security guard with a piece of 4x2 timber.

The man charged with Mr Dhaliwal's murder was acquitted.

He has name suppression.

Detective Sergeant Murray Free has told the inquest Mr Dhaliwal was on his first shift, and had been briefed by a manager and given a hi-vis vest and a pair of work boots.

There was no further contact after that with the company.

Depot workers discovered Mr Dhaliwal's body lying face down on a piece of poured concrete.

They'd finished their shift and were expecting to be met by the guard.

A man whose name is suppressed was acquitted of his murder, and a court also found his employer, CNE Security, was not responsible for his death.

A spokesperson for Mr Dhaliwal's family in India said prior to the start of the hearing they remain bitter over their experience with the New Zealand justice system.

"They're still looking from the employer ... [they're] wanting to know why their son was killed and why steps [were] not put in place [to ensure] safety for preventing this from happening. They're looking for answers."

The spokesman said Mr Dhaliwal's family is unable to attend the inquest, because his mother is in hospital. He reports she remains absolutely shattered over her son's death and is still looking for answers.

"She is not herself anymore. She said she did not want to send the other son alone so you know what that means. She doesn't want to send anyone alone to this country."

The Council of Trade Unions wants to see robust health and safety recommendations from the inquest.

CTU President Helen Kelly is welcoming the inquest and "hoping that the coroner will look into the circumstances of his employment and make recommendations to ensure that generally in future security guards will be safer at work."