June 02, 2016 10:50 AM

One victim in the University of California, Los Angeles, shooting that locked down campus and canceled classes on Wednesday was an engineering professor and father of two who coached little league baseball, according to multiple reports.

Friends of 39-year-old William Klug described him as a “gentle” man who rarely had problems with anyone.

“He’s such a young professor. He was just very kind and respectful,” Jim Gimzewski, one of Klug’s UCLA colleagues, said through tears as he described Klug to the Associated Press as a “kind, gentle soul with a brilliant mind.”

“I could never have guessed that this would happen to him. It’s just so tragic.”

PEOPLE confirms that Klug, reportedly an El Segundo resident, died in what officials called a murder-suicide at a small office in UCLA’s Boelter Hall. Police responded to reports of gunfire at the building just before 10 a.m., which resulted in a campus-wide lockdown implemented well into the afternoon.

Peter Gianusso, president of the El Segundo Little League and Klug’s friend, said the professor coached his son’s little league baseball team and the man’s death left a “hole in the heart of El Segundo Little League.”

“They really can’t believe it because Bill was one of the kindest, most light-hearted, quiet person [sic] that you’d ever meet,” Gianusso told the AP.

“Just a great, nice guy all around and to meet his death in such a tragic horrific manner, is just shocking and unbelievable.”

Johnny Dodd

A GoFundMe page set up for Klug’s family, indicates that the man had a young son and daughter and “his family was the most important thing to him.”

Colleagues described Klug as an avid surfer with a strong Christian faith and Lance Giroux, who described himself as Klug’s close friend, told CBS Los Angeles that the community plans to rally behind the slain professor’s family.

“It’s just very, very sad to hear this,” Giroux said through tears, noting that Klug was “very positive” and never spoke a “negative word.”

“To have your son grow up without a dad is rough.”

According to his university profile, Klug specialized in biomechanics and micro/nanomechanics. The AP reports that he was in the midst of an intricate study of biomechanics to learn more about viruses and the human heart.

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