Karnataka officer MK Ganapathi had accused KJ George of harassment, a day before he killed himself.
KJ George, who had quit Karnataka government after he being accused of aiding suicide of a senior police officer, will be sworn in the cabinet on Monday.
The state CID has given clean-chit to Mr George and two other senior police officers in connection with the alleged suicide of Deputy Superintendent of Police MK Ganapathy.
Chief Minister Siddaramaiah will reinstate Mr George in the cabinet, where he is likely to be re-allotted the Bengaluru Development portfolio.
The Bengaluru lawmaker was forced to resign as minister after a police case was filed against him.
Before committing suicide in July, 51-year-old police officer had given an interview to a local TV channel alleging that Mr George and senior police officers Pranob Mohanthy and AM Prasad had harassed him, and that they were responsible for his impending suicide.
The incident had kicked up a huge storm in the state.
Although the government ordered an investigation, George had not stepped down as minister.
Mr Ganapathy's son Nehal then lodged private complaint with a court in Madikeri, which ordered an FIR to be filed against George. It was after this, that George resigned.
Congress Working President Dinesh Gundu Rao maintained that there had been no need for George to resign. However, George had done so as he did not want to embarrass the party.
Eventually, the CID had filed its B Report to the Madikeri Court stating that there is no clear evidence against three who were named in the case and a clean chit was given.