According to a brother who was with him minutes before his death, the man had decided to delay going to his shop, preferring to first withdraw the cash.
The money was stashed in an envelope and the businessman put on a long coat to try and conceal the hefty package.
He used a matatu to head back to his workplace.
On alighting the PSV, Mr Wanderi met his elder brother who spoke to him briefly before they bid each other goodbye.
A few minutes later, the brother heard a loud sound followed by screams. He made his way in the direction of the screams.
The brother saw people running towards him.
"Turn your car round! your brother has been shot and you must rush him to the hospital!" someone shouted.
He sadly realized it was John Wanderi who was shot.
The good Samaritans helped pick up his brother and rushed him to a nearby hospital.
"He was still gasping for air when we got to the hospital. The doctors quickly put him on the oxygen machine and inserted the IV tube to try to counter the massive fluid loss. Unfortunately, it did not work and he died," the brother said.
According to later accounts of the incident, men on boda boda approached the businessman as he opened up the shop.
They accosted him and gunshots fired.
A hospital report revealed Mr Wanderi was shot in the back and the bullet dislodged at the left side of the chest.
He died from internal bleeding.
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