Mohammed, son of Ahmed Gulak, a former aide of ex-President Goodluck Jonathan, says his father visited Imo as a member of the committee on constitutional review.
Gulak, a chieftain of the All Progressives Congress (APC), was killed on Sunday in Owerri, Imo state capital.
The police said six armed persons intercepted his car and shot Gulak who was reportedly on his way to the airport.
According to the police, Gulak left his hotel without any security personnel.
The deceased was the chairman of the APC committee that conducted the primaries for Imo governorship election in 2019.
Speaking on the incident, Mohammed told BBC Pidgin that he was in his room on Sunday morning, waiting for a driver to take them to the airport to receive his father before news of the shooting broke.
He added that the deceased’s personal assistant was the first person to call the family via telephone to ask if they had heard what happened and ended the call when the response was in the negative.
Mohammed said the oldest son broke the news to the family when he entered the house in tears.
“On Sunday morning, I was in my room waiting for his (Gulak) driver to come so that we can go to the airport to bring him home,” he said.
“It was our father’s personal assistant that first called via the telephone to ask us if we have heard what happened. When we said ‘no’, he ended the call. Maybe he did not want to break the news to us.
“A few minutes later, our eldest brother came into the house crying and he told us about the news of our father’s death. The first thing I did was to call his telephone line to confirm and it did not go through.
“Afterwards, everybody in the house began to cry.’’
On what took Gulak to Imo, he noted that the deceased was part of the committee on ongoing constitutional review.
“On Saturday, I called him at exactly 8pm to greet and wish him safe journey back home the following day. He was happy and told me ‘God bless you, my son’,” Mohammed said.
“He was part of the committee on constitutional review. He went to Owerri to carry out the work.”
Meanwhile, a regional hearing on the constitution review scheduled to hold in Owerri on Tuesday, has been postponed indefinitely.