Police are investigating the final movements of a young tourism worker strangled to death in the bathroom of an apartment in Queensland on Good Friday.

Investigators are hoping DNA tests on others in the Bingli Bay townhouse, on Queensland’s far north coast, will provide a breakthrough, the Courier-Mail reports.

A 32-year-old man, who works in local tourism, spent two days in custody as a key person of interest in the murder but police released him on Monday night without charge.

The body of Ms La Spina, a 26-year-old river rafting guide, was found in an apartment at 5pm last Saturday.

She had celebrated Good Friday with work colleagues at pubs in Mission Beach and then joined a late-night beach party at Bingil Bay before returning to the Mission beach about 2.30am.

“Sometime after sun-up on Saturday, this incident has unravelled,” Far Northern regional crime co-ordinator Detective Acting Inspector Kevin Goan said.

Ms La Spina’s two rafting guide housemates went to work that morning and left her sleeping.

On their return they made the horrific discovery.

Police have declined to say if Ms La Spina was found naked or if there were signs of sexual assault.

The findings of a post-mortem are yet to be released.