Rabi said this while being interrogated by policemen in Hausa language.
Our correspondent obtained a video clip of the interrogation on Thursday.
The suspect said he and his friends received information that Badeh was in possession of a huge sum of money which he wanted to use in purchasing a parcel of land in Nasarawa State.
The 25-year-old suspect said after killing Badeh, he and his friends stole a bag which contained a huge sum of money.
Rabi said, “What happened was that, on a certain day, my elder brother went to a market, where he met with one Churuma. Churuma told him that he got information that an old soldier (Badeh) wanted to buy a parcel of land but would be buying the land in cash.
“He said we would trail the soldier on that day and we would block him and collect the money. So, on that day, when we saw him coming Churuma signalled to us that it was him. Some of us stayed behind his vehicle in case he would want to reverse while Churuma stayed in front.
“But when he (Badeh) saw Churuma with a gun, he did not do like he wanted to reverse, he attempted to hit Churuma with his car but Churuma dodged to the side and then opened fire on him.
“After that, we opened the car and found a bag of money and went with it. When they opened the bag, the money was beyond what I had ever seen before.”
When asked if the money was in naira or foreign currency, the suspect said it was in naira.
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He added that they were able to abduct Badeh’s friend who was in the car.
The former CDS was killed in the evening of December 18, 2018 while returning from his farm between Koso and Kugwaru communities.
The former CDS’ four military guards who provided security were said to have been a few kilometres away when the attack took place
At the time of his death, Badeh was being prosecuted by the Economic and Financial Crimes Commission for allegedly diverting N3bn from the accounts of the air force.
The former CDS had forfeited money and choice properties to the Federal Government before his death.
Police believe that Badeh decided to carry out transactions in cash because all his accounts had been frozen by the EFCC.