1 of 3
Nick Ut, Associated Press
Los Angeles County Department of Medical Examiner-Coroner officials remove a body at the scene of a fatal shooting at the University of California, Los Angeles, Wednesday, June 1, 2016, in Los Angeles. About two hours after the first 911 call came in around 10 a.m., with the center of campus still saturated with officers, Los Angeles Police Chief Charlie Beck said it was a murder-suicide and declared the threat over. Two men were dead in an engineering building office, and authorities found a gun and what might be a suicide note, he said.

LOS ANGELES — The victim of a murder-suicide that locked down the UCLA campus for hours Wednesday was a mechanical engineering professor who was married with two children, according to a law enforcement official with knowledge of the investigation.

The official, who spoke on condition of anonymity because they were not authorized to speak publicly about the case, identified the victim as William Klug.

The shooter has not been identified.

Those who knew the 39-year-old Klug said he was kind and patient, and that there was no indication he had a conflict with anyone.

"He's a great guy, great father, great husband," said Peter Gianusso, president of the El Segundo Little League and a friend of the Klug's.

He said Klug coached his 10-year-old son's team and spent countless hours on the field with the boys and girls in the league.

"Today there's a hole in the heart of El Segundo Little League," Gianusso said. "They really can't believe it because Bill was one of the kindest, most light-hearted, quiet person that you'd ever meet. Just a great nice guy all around and to meet his death in such a tragic and horrific manner, is just shocking and unbelievable."

Gianusso said Klug had a younger daughter but did not know her age.

He said he can't imagine Klug having any problems with anyone after watching him interact with the children in the league. "I just can't wrap my head around that," he said.

Charles Knobler, a biology and chemistry professor at UCLA who said he knew Klug for 10 years, said he last saw Klug for lunch last week.

"I just can't believe it," Knobler said. "I never, ever thought Bill Klug would have been the person who was involved. It's beyond belief that someone did this.

"He's a very lively, lovable, likable guy," Knobler added.

Jim Gimzewski, another colleague at UCLA, was in tears talking about Klug, who he said was "kind, gentle soul with a brilliant mind."

"He's such a young professor. He was just very kind and respectful," Gimzewski said. "I could never have guessed that this would happen to him. It's just so tragic."

Klug was working in the complex and intricate study of computational biomechanics. He and his collaborators worked on developing computer models to study such things as the protein shells of viruses and the contraction of the human heart.

Some viruses, for instance, change shape as they mature and become infectious.

"He was trying to discover how that happened," said Alex Levine, a physics and biochemistry professor who collaborated with Klug and was his friend for a decade.

"I was shocked and I'm still shocked. I'm devastated to lose a friend and a colleague," Levine said.

Klug also was an avid surfer and had a strong Christian faith, colleagues said.

Renjie Li, a 21-year-old mechanical engineering junior at UCLA, said Klug was one of his favorite professors.

"He was smart, very patient," Li said. "When I took his class last year, I always went to his office hours and asked a bunch of questions, and he always answered with passion. He's very approachable."

Just last month, he said Klug agreed to write a recommendation letter for his application to grad school.

"I'm outraged," Li said. "He had such a bright future."

Associated Press writer Bob Jablon contributed to this report.