Mr. Svensson offered no protest when another Karolinska official notified him of his expulsion, she said.

Mr. Svensson did not respond to numerous attempts to reach him for this article.

In 2000, Mr. Svensson, then Mr. Hellekant, was convicted of shooting a trade union worker, Bjorn Soderberg, 41, seven times after a loud argument outside Mr. Soderberg’s apartment in a Stockholm suburb on the night of Oct. 12, 1999. Mr. Soderberg had complained about a co-worker who displayed his neo-Nazi beliefs at work, leading to the co-worker’s loss of a job and union position. The co-worker was a friend of Mr. Svensson’s.

At the time of the killing, according to court records and Stockholm police officials, Mr. Svensson was under surveillance for neo-Nazi activities by the Swedish Security Service, the equivalent of the Federal Bureau of Investigation.

Despite the conviction, Mr. Svensson maintained that he did not commit the killing.

After serving 6 1/2 years of an 11-year sentence, Mr. Svensson was released on parole in February 2007. According to Swedish prison standards, inmates are usually released after serving two-thirds of their sentence.

While imprisoned, Mr. Svensson took a number of online courses that met the Karolinska’s high standards. Two admissions committee members interviewed him separately, Dr. Wallberg-Henriksson said. One was a psychiatrist. But neither interviewer detected anything unusual or asked him to explain his activities during the previous six-and-a-half-year period, she said.

She notified Mr. Svensson’s classmates by intranet on Thursday of the decision to expel him. On Friday she said she would address the students, her third meeting with the student body concerning Mr. Svensson’s case.

Dr. Wallberg-Henriksson first met with students last fall to tell them that a convicted murderer was a classmate.