Scottish Labour interim leader Alex Rowley has resigned over his alleged misconduct in the past, the party has said.
His resignation comes after The Scottish Sun published a report of allegations leveled at him by a former partner.
His partner, a 49-year-old woman, had accused him of subjecting her to years of "emotional blackmail and abuse."
The woman, who has chosen to remain anonymous, said the Scots Labour chief "destroyed my life," pledging to speak out as a sex scandal continues to engulf Westminster and Holyrood.
In response, Rowley issued a statement, saying, "I totally refute these allegations and will take all steps necessary to clear my name."
"These allegations must be properly and thoroughly investigated in line with our party’s procedures – and I will refer myself to the party so such an investigation can take place."
"While that investigation is carried out, I will step aside as Deputy Leader, as well as Interim Leader, of the Scottish Labour Party."
Earlier this month, Scottish childcare minister Mark McDonald also resigned over his "inappropriate behavior."
The 37-year-old member of the Scottish National Party (SNP) admitted that his “previous actions have been considered to be inappropriate.”
British Prime Minister Theresa May has announced new measures to counter sexual harassment.
A new survey by the BBC found that 53 percent of women and 20 percent of men in the UK said they had been sexually harassed at work or a place of study.