The Norfolk coroner - accepting the case because the late Ms Witheridge was from Hemsby in Norfolk in the UK - opened the hearing on January 6 looking into the death of the tourist on the Thai resort island.
Ms Witheridge and fellow British tourist Mr David Miller were murdered on the resort island on September 15. Two Myanmar migrants workers are charged with their murder.
The coroner adjourned the case until October 15. The court is waiting for the Thai police report on the case.
Myanmar nationals Ko Zaw Lin Oo and Ko Wai Phyo (formerly known as Ko Win Zaw Htun), both 21, are charged with the murder of the two Britons. They have pleaded not guilty. Their case is ongoing, set to resume in July.