According to his friend Nelson Arebanmhen, who posted the photos, the boat he was traveling in capsized. He drowned because he was not wearing a life jacket. There is no mention of where the incident occurred.
"I'm pained dat my paddy is no more. Just one month to complete d Nysc scheme and death snatched u away. Rip Uduebor Johnson keep resting till we meet again. Biochemistry class of 2015 missed u." he wrote