(CNN) Norwegian multimillionaire Tom Hagen has been arrested on suspicion of killing his wife, Anne-Elisabeth Hagen, who disappeared 18 months ago.

Hagen's lawyer denies the property and energy mogul was involved, and he has not yet been charged with any crimes.

Anne-Elisabeth Hagen, 69, disappeared in October 2018 and the family said a ransom had been demanded for her release, but on Tuesday Norwegian police arrested Hagen, 70, on suspicion of killing her, according to public broadcaster NRK.

Anne-Elisabeth Hagen disappeared in October 2018.

The case was first reported in January 2019, attracting widespread attention in a nation where crime rates are low.

Police say they now believe Anne-Elisabeth was killed and not abducted, and have enough evidence to "suspect" Tom of her killing.

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