Los Angeles: The gunman who shot and killed a UCLA professor Wednesday has been identified as Mainak Sarkar, a former doctoral student who had accused the victim of stealing his computer code and giving it to someone else, according to Los Angeles police, reported Los Angeles Times.

Sarkar took his own life after killing William Klug, 39, in a small office in UCLA Engineering Building 4, sources confirmed.

Klug was an associate professor of mechanical and aerospace engineering and had been the target of Sarkarâ€™s anger on social media for months. On March 10, Sarkar called the professor a â€œvery sick personâ€ who should not be trusted.

â€˜William Klug, UCLA professor is not the kind of person when you think of a professor. He is a very sick person. I urge every new student coming to UCLA to stay away from this guy. He made me really sick. Your enemy is my enemy. But your friend can do a lot more harm. Be careful about whom you trust,â€™ Sarkar wrote.

Prof William worked with a team to develop a computer-generated virtual heart, media reports said. He was married with two young children.

Meanwhile, a source called the accusations of Sarkar â€œabsolutely untrue.â€ â€œThe idea that somebody took his ideas is absolutely psychotic,â€ the university source said.

Klug, who was described by friends as a kind and caring man, bent over backward to help Sarkar finish his dissertation and graduate even though the quality of his work was not stellar, the source added.

\"Bill was extremely generous to this student, who was a subpar student,â€ the source said. â€œHe helped him out and interceded for him academically.\"

In his doctoral dissertation, submitted in 2013, Sarkar expressed gratitude to Klug for his help and support.

A syllabus from 2010 lists Sarkar as one of two teaching assistants in a mechanical and aerospace engineering course, MAE: 101: Statics and Strength of Materials. Sarkar was listed in the 2014 doctoral commencement booklet with Klug as his advisor.

â€œThank you for being my mentor,â€ he wrote in the acknowledgements, according to LA Times.

Before enrolling at UCLA, Sarkar earned a masterâ€™s degree at Stanford University following an undergraduate degree in aerospace engineering at the Indian Institute of Technology in Kharagpur, according to his LinkedIn page.

In the U.S., he also had a stint as a research assistant at the University of Texas and worked as a software developer.

After UCLA, Sarkar worked remotely as an engineering analyst for an Ohio-based rubber company, Endurica LLC.

\"I am absolutely devastated,\" Alan Garfinkel, professor of integrative biology and physiology who worked with Klug to develop a computer-generated virtual heart, was quoted as saying by the Los Angeles Times.

\"You cannot ask for a nicer, gentler, sweeter and more supportive guy than William Klug,\" Garfinkel added.

Klug earned his under-graduate degree in engineering physics from Westmont College in 1997, his Masterâ€™s in civil engineering at UCLA in 1999 and his Ph.D. in mechanical engineering from California Institute of Technology in 2003.

The shooting happened shortly before 10 a.m. in Boelter Hall, which is part of the Samueli School of Engineering and Applied Science, according to the university.

Shortly, the entire campus was placed under lockdown. About an hour after the shooting was reported, police confirmed two dead people were found inside a small room of the engineering building.

â€œOur hearts are heavy this evening as our campus family mourns the sudden and tragic deaths of two people on our campus earlier today,â€ said Chancellor Gene Block in an email to the UCLA community.

â€œThe thoughts and prayers of our entire UCLA family are with the victimsâ€™ families and the students, faculty and staff of UCLA Engineering,\" he added.

UCLA shooter was Mainak Sarkar, a former doctoral student