Wilpers died Thursday, a son said.
Tojo attempted to commit suicide the day Wilpers' Army intelligence team reached him, but the Army transported him to a hospital, where he recovered, the Times said.
He was later tried for war crimes and was executed in 1948.
Wilpers, who worked for the Central Intelligence Agency for 33 years after leaving the Army, didn't tell his family about the event for many years.
"All of this was very sad," he said of the war in 2010 after receiving the Bronze Star. "I didn't want to do anything to describe it as wonderful. What happened happened. Like any war, it should be regretted."
He is survived by his two sons and three daughters, the Times said.