Outgoing deputy Local Government Minister Godfrey Kamanya shot himself in his home, according to police.
His spokesman denied reports that his suicide was linked to him apparently losing his parliamentary seat.
Official results have not yet been declared in what was expected to be a tight presidential race.
The BBC’s Raphael Tenthani in Malawi’s commercial capital, Blantyre, says the electronic counting system has broken down in some areas and votes are being collated manually in these places.
Mr Kamanya left a suicide note at his home in the capital, Lilongwe, asking President Joyce Banda to take care of his daughter and provide for her education, our reporter says.
Eleven candidates ran against Mrs Banda, but her main challenger is seen as Peter Mutharika, the brother of former President Bingu wa Mutharika.
The Malawi Election Commission (MEC) will announce results when 30% of votes have been counted, its chairman Maxon Mbendera said on Wednesday.
The MEC was “not anywhere in the neighbourhood” of that figure, he added.
Counting was being done manually because the electronic system was “refusing to take the information from the ground where our data clerks are stationed to send the results,” chief elections officer Willie Kalonga told the AFP news agency.
Voting spilled into a second day at 13 voting stations, and thousands queued to cast their ballot.
In some places, voting boxes or lids did not arrive, so officials used buckets and plastic wrap, correspondents say.
In their preliminary assessment of the election, Commonwealth observers said it had been “peaceful, orderly and transparent”, although there had been “serious shortcomings” in the distribution of election material and “isolated incidents of violence” because of the delays.
Around 7.5 million people were eligible to vote in the fifth elections since the end of one-party rule 20 years ago.
An Entrepreneur and Philanthropist. Editor-in-Chief of www.233times.com. A Senior Journalist with Ghanaian Chronicle Newspaper. An alumnus of Adisadel College where he read General Arts. He holds first degree in Bachelor of Arts from the University of Ghana; Political Science (major) and History (minor). He has also pursued MSc Corporate Social Responsibility (CSR) and Energy with Public Relations (PR) at the Robert Gordon University in the United Kingdom. He is a 2018 Mandela Washington Fellow (YALI) who studied at Clark Atlanta University on the Business and Entrepreneurship track. His mentors are Rupert Murdoch, Warren Buffet, Sam Jonah, Kwaku Sakyi Addo and Piers Morganview all posts by: Nana Kwesi Coomson
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