Dr Catherine Mullany and her physiotherapist husband Ben were attacked in their cottage in what police believe was a bungled robbery at 4.40am on Sunday, the day before they were due to fly home.
Dr Mullany was found dead at the scene. Her husband is still in intensive care with a neck wound in Antigua.
Dr Mullany, from Ponterdawe, South Wales, trained at Imperial College School of Medicine in London, qualifying as a doctor in 2002. She was due to take up a GP post in Skewen, South Wales, in September.
BMA Wales’ chairman Dr Tony Calland said: ‘We were deeply saddened to learn of Dr Mullany's untimely death whilst on her honeymoon and we extend our deepest sympathy and condolences to her family, friends and colleagues who are left behind to grieve.
‘To be killed whilst on honeymoon — at the start of married life — is appalling, shocking and tragic.
‘To her husband we wish a speedy and complete recovery.’
Six people are being questioned by police over the murder.
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