Investigators in Mexico recovered evidence from the body of an Ontario woman who was brutally slain along with her husband at a luxury resort, media reports say.

The Toronto Sun is reporting that investigators lifted traces of hair from Nancy Ianiero's hand before her body was returned to Canada.

Ianiero, 55, and her husband Dominic, 59, had their throats slashed last month at a five-star resort on the Mayan Riviera, where they had gone to attend their daughter's wedding.

The hair sample is being analyzed by a laboratory in Mexico City and is believed to belong to the killer, a Mexican journalist is reported as saying. 

A unnamed source in the Mexican Attorney General's office has confirmed that lab results should be available in the coming days, the Sun reports.

The source also says Mexican police took statements and hair samples from the wedding party before they returned to Canada.

The latest developments in the case come a day after unconfirmed media reports said Mexican authorities were seeking four hotel employees as part of their investigation.

This contradicts earlier reports, where Mexican investigators ruled out hotel workers.

Meanwhile, two veteran RCMP investigators have arrived in Mexico to help with the investigation.

The Canadian investigators left for Mexico earlier in the week, and are now working alongside the Mexican police who are leading the investigation.

The Ianieros were laid to rest Monday. More than seven hundred mourners attended the private funeral service in Woodbridge, north of Toronto.

Local police photographed license plates of the vehicles of many of those who attended as part of the investigation.