A police spokesman contacted by AFP could not immediately confirm the reports.
The unidentified official, who was found dead on Wednesday, was at the heart of a scandal over the cut-price sale of government-owned land to a close friend of Abe, the reports said.
He was responsible for the 2016 sale of a plot of land in Osaka to the right-wing operator of a kindergarten at a price well below market value.
Separately, Finance Minister Taro Aso told reporters that another senior official involved in the scandal, Nobuhisa Sagawa, had decided to step down after lawmakers and taxpayers demanded his resignation.
"Sagawa is a capable individual," said Aso.
"He said he wants to resign to take responsibility for the troubles caused."
In addition to the resignation, Sagawa will have 20 percent of his severance package docked for three months as punishment, the minister told reporters.
According to local media, the land was sold for around one tenth of its market value, and the kindergarten had announced plans to name Abe's wife Akie the honorary principal of a primary school being built on the same plot.
Abe says his wife had only "reluctantly" accepted the post of honorary principal and had since "resigned."
Last week, allegations emerged that the finance ministry's documents on the sale had been tampered with before being submitted to parliament.
The allegation has paralysed parliament in recent days, with some opposition lawmakers boycotting debates.
The opposition has accused ministry officials of hiding some key documents and colluding to cover up the scandal.
Aso said he had told his ministry staff to come up with conclusions early next week but stressed he himself had no plans to step down over the scandal.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)