According to the South Korean Coast Guard, the missing official shot and killed by North Korea last week when he crossed the sea border was trying to defect.
In its intermediate findings released Tuesday, the Coast Guard pointed to the fact that the man was wearing a life jacket when he went into North Korean waters.
Also, it said North Korea was aware of the man's name, age and hometown.
Meanwhile, the Coast Guard and the Navy continued their search for the man's body and belongings for the ninth day.
Some 40 vessels and seven aircraft have been mobilized near the Northern Limit Line, which is the de facto inter-Korean maritime border.