BOSTON -- A part-time Boston University student was held on bail Thursday after being accused of making a death threat against a woman he once dated.

NewsCenter 5's Steve Lacy reported that Andrew Rosenblum threatened to carry out a massacre similar to Virginia Tech at her school. His attorney, Jay Carney, said that it was a misunderstanding caused by the pain of a recent breakup and the death of Rosenblum's grandmother.

Police said Rosenblum sent a series of instant messages to a Wheelock College student late Monday night and early Tuesday.

"I'm gonna bring a gun to your school and kill you and (the other female student) and everybody you love. It's gonna be VT, (a reference to the Virginia Tech massacre earlier that day), all over again. Seriously, I'm just that demented," one message said.

Rosenblum spent the last two days undergoing psychiatric evaluation at Newton Wellesley Hospital and was arraigned in Roxbury District Court on Thursday.

He pleaded not guilty to three counts of threatening to commit a crime.

"Mr. Rosenblum threatened to bring a gun to the school to kill one of the individuals as well as the other and everyone that they loved," prosecutor Jonathan Tynes said.

Officials said that Rosenblum is on a semester break from Marist College and he started sending the messages late Monday night, hours after the massacre at Virginia Tech.

"There are two individuals. One who has known Mr. Rosenblum for some time. They have essentially known each other since childhood. The other has been in a recent dating relationship with Mr. Rosenblum," Tynes said.

"This is a case where an immature young man, despondent over the death of his grandmother and the breakup with a woman he cared a lot about used some inappropriate language to show the level of his pain," Carney said.

Rosenblum is expected to be released on $50,000 bail later Thursday. As part of the terms of his release, he will wear a GPS monitoring bracelet and stay under the custody of his parents at their Needham, Mass., home.

The court did not impose any restrictions on his use of the Internet.