Lagos State Government accused Mr Nielsen of smothering his Nigerian wife and three-year-old daughter to death.
Peter Nielsen, a Danish national, has been condemned to death by hanging for killing his Nigerian wife and daughter.
Justice Bolanle Okikiolu-Ighile of the Lagos State High Court on Friday convicted Mr Nielsen, 54, on two counts of murder.
The charges were preferred against Mr Nielsen by the Lagos State Government.
The Dane was charged with the death of his wife and singer, Zainab, and their three-year-old daughter, Petra.
Lagos State Government accused him of smothering Ms Zainab and Petra to death at 3:45 a.m. at No. 4, Flat 17, Bella Vista Tower, Banana Island, Ikoyi, Lagos State.
Mr Nielsen was arraigned on June 13, 2018.
He pleaded not guilty to the two-count charge of murder contrary to Section 223 of the Criminal Law of Lagos State, 2015.
