The estranged husband of former Scottish leader Nicola Sturgeon pleaded guilty Monday to embezzling more than 400,000 pounds ($540,000) from the Scottish National Party to fund a lavish lifestyle when he was its chief executive.

Peter Murrell, 61, who was remanded into custody in the High Court in Edinburgh after his plea, admitted he used the money to buy a motorhome, two cars and luxury goods.

"By embezzling from the SNP, Peter Murrell was stealing the hopes, the dreams and the aspirations of thousands of people all over Scotland, people who gave what they could over many years in the hope that it would help contribute to a better country," SNP leader John Swinney said at a press conference. "I am horrified, I am betrayed."

Murrell's plea caps a five-year police investigation and a tumultuous period for Scotland's dominant party and the former power couple once at its helm.

Following big gains for the SNP in the Scottish Parliament in 2021, signs of internal turmoil exploded less than two years later as questions swirled about the SNP's finances and dwindling membership numbers.

Sturgeon, who dominated Scottish politics for almost a decade, abruptly resigned as first minister of Scotland's semi-autonomous government in February 2023 after serving more than eight years in the role. Observers were bewildered by her announcement that she knew in her "head and in my heart" that it was the right time to go.

A month later, Murrell quit his job after two decades as party executive. He took responsibility for misleading the news media about the collapsing membership of the party.

Three weeks later, police showed up at the couple's Glasgow home and arrested Murrell.

Officers spent two days searching the house. They also searched SNP headquarters in Edinburgh and confiscated a luxury motorhome parked in the driveway at Murrell's mother's home north of the capital.

Assistant Chief Constable Stuart Houston said the investigation, which cost 2 million pounds ($2.7 million) in public funds, was lengthy and complex because Murrell covered his tracks over a 12-year period by cooking the books.

"Peter Murrell has shown utter contempt for the high public trust placed in him," Houston said. "He abused his privileged position with access to Scottish National Party funds to divert cash into his own accounts and bankroll the lavish lifestyle he craved but could not afford."

Sentencing was scheduled for June 23.

Police Scotland's investigation into how the SNP spent more than 600,000 pounds ($810,000) designated for a Scottish independence campaign cast a cloud over the party, Sturgeon and her legacy.