Former high-flying road cop Tania Baron (43) left her role as part of a mediated exit arranged by lawyers and police.
Her resignation followed the end of her marriage and the start of a relationship with the teen, who is less than half her age.
Baron's boyfriend, whom the New Zealand Herald has chosen not to name, has been modelling since he was 11. The blond, six foot teen is also a keen athlete.
Baron left her role last Thursday. It is unknown if the relationship was the direct cause of the resignation.
The Herald understands Baron's boyfriend is staying at her house, where her teenage children also live.
Baron told the Herald yesterday her boyfriend, now 18, was "not a schoolboy".
She has signed a non-disclosure agreement and said she could not comment further.
The pair are believed to have bonded over a shared interest in cycling. His parents had spoken with police about the pair's relationship last year.
Southern District commander Superintendent Paul Basham refused to comment.
"The individual you have named is a former member of NZ Police," he said in a written statement.
"We do not discuss employment matters relating to current or former staff and have no comment to make."
