Nwankwo was said to have hugged, kissed and displayed his private part to the 43-year-old cleaner.
Alarmed, she alerted the management of the condominium, which sent seven of its personnel to her rescue on the 15th floor. On their way, they met the cleaner running towards them.
Minutes later, Nwankwo came down to the ground floor where they caught him and beat him before tying him up and informing the police.
“When we arrived, we found him motionless,” ACP Abdul Rashid said, adding that police rushed him to a nearby clinic where he was pronounced dead.