AURORA - While Colorado was focused on flooding last week, Aurora Police and law enforcement statewide mourned the death of Sensei Robert Koga.
Koga taught officers the mass casualty response techniques they used during Aurora.
When Aurora Police faced an unthinkable tragedy, Koga was a voice of calm.
"Bob was very proud of the way the Aurora officers responded to that situation," said Sergeant Michael Holm, who trained with Koga for more than 30 years.
Police in Colorado, across the country, and around the world studied the Koga Method.
"The concept was control. To control oneself, and control the situation, and control a suspect," Holm said.
Koga began honing those skills as a child during World War II, in the Japanese Internment Camp in Topaz, Utah.
He also lived in Denver.
"He an affinity for this area because he grew up here," Holm said.
Koga later served in the U.S. Air Force during the Korean War and spent nearly 25 years as a Los Angeles Police Officer.
After retiring, he founded the Koga Institute with the philosophy "No Give Up."
"He focused his life on trying to make law enforcement response better," Holm said.
Colorado is home to many of Koga's senior students.
Koga was 82 when he told 9NEWS last July, he had no plans to slow down.
"There are not too many guys my age out there doing what I do," Koga said.
After the interview, Koga was diagnosed with mesothelioma, a cancer caused by asbestos exposure.
He died earlier this month at 83.
"His legacy will continue," Holm said.
Holm says Koga's training has saved countless lives, including many of the people rescued from the movie theater that night and the Koga Institute will continue to teach law enforcement.
"I believe we'll be a better place for what he offered us," Holm said.
Koga's voice of calm will live on.
(KUSA-TV © 2013 Multimedia Holdings Corporation)