Three decades after the brutal stabbing murder of a 20-year-old Italian tourist, a record reward for information relating to the cold case has been offered.

Victoria Cafasso had been in Tasmania less than a week when her body was discovered on October 11, 1995, at Beaumaris Beach on the state's picturesque east coast.

Police on Friday doubled a reward for intel that leads to a conviction to $1 million - the largest ever offered in Tasmania.

"This was a random and particularly vicious attack committed on a young lady who was at the beginning of her life," Assistant Commissioner Adrian Bodnar told reporters.

"Someone must know something."

Ms Cafasso was seen sunbaking on Beaumaris Beach on the morning of October 11 after walking there from her nearby accommodation.

Her body was found i

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