Henryk Piotrowski, 43, a father of two, was found dead inside the contents of a bin lorry at a waste recycling facility in Walkinstown, south Dublin, on Aug 23. The homeless man had somehow ended up in a commercial wheelie bin overnight on Aug 22 before it was collected in the early hours of the next day.
While the autopsy showed he died from suffocation, it also revealed he had suffered injuries to his face and head consistent with an assault.
This led to suspicions that he either climbed into the bin because he was disorientated after being assaulted, or that his attackers subsequently dumped him into the bin.
Gardaí at Crumlin Station launched a major investigation, involving the gathering and examination of a large number of CCTV recordings from commercial premises in the south city.
Detectives also spoke to staff at a range of hostels and homeless services in the city centre to build up a picture of who Mr Piotrowski associated with or knew.
Garda inquiries led to the arrest yesterday of two homeless people, understood to be Polish, in Dublin city centre.
A man, aged in his 40s, and a woman, aged in her 30s, were taken to Crumlin Garda Station and detained under section four of the Criminal Justice Act 1984.
They can be held for a maximum of 24 hours, excluding breaks.
Mr Piotrowski had no family in Ireland, but was estranged from his wife and two children in Poland.
He was last seen begging near the Central Bank in Dame St, with further reported sightings around Merchant’s Quay.
It was initially thought Mr Piotrowski may have sought shelter in the wheelie bin from the rain.
However, the autopsy by assistant State pathologist Michael Curtis, which revealed the assault injuries, changed the course of the investigation.
Gardaí estimated some 56 commercial collections were made on the morning Mr Piotrowski was discovered. They had to make contact with each premises to secure CCTV.