NEW HAVEN, Conn. - Finding out what killed Andre Narcisse, the Yale sophomore from Roosevelt found dead over the weekend in his dorm, could take up to six more weeks while the state medical examiner awaits toxicology test results and further autopsy analysis, authorities said.

A spokeswoman for the Connecticut state medical examiner said the cause of Narcisse's death is "pending further study."

The delay in solving the mystery of Narcisse's sudden death came as some of his friends here wore blue to honor the gregarious 19-year-old. His high school teachers on Long Island said he excelled at science and his friends on this Ivy League campus mourned him as the nexus of their social circle.

Occasions to grieve Narcisse - suitemates found him unconscious Sunday morning in his Branford dormitory - have been big and small. At a late-night candlelight vigil held Monday night, hundreds extended their condolences to Narcisse's parents. At another held in a campus chapel just hours after Narcisse was found, some of his closest friends mourned late into the evening.

"It was just hugs all around," Alpern said of one of the somber gatherings. After the Monday vigil here, Narcisse's parents stayed and heard from his college friends how much he meant to the Yale community, said classmate Kyle Alpern, who had been close to Narcisse since their freshman days.

Yale student Eugérie André Narcisse, 19, of Roosevelt, was found dead in his Yale University dorm room on Nov. 1, 2009, officials said. Photo Credit:

"There's one thing he loved more than anything else, and that was just people being together," said Alpern, 19, who was also one of Narcisse's pledge brothers in their fraternity, Sigma Nu.

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Friends said they'll miss the thoughtfulness of Narcisse, an aspiring economics major with interests as diverse as their dorm's Gothic architecture, Wall Street and music.Alpern recalled how, even during the summer when Narcisse was home on Long Island, Narcisse shared his insatiable curiosity with his friends, once sending Alpern an Internet link via Facebook to a story about an investor who had bet against subprime mortgages, become madly rich and retired.

"He always had questions, and he always had things to say," Alpern said. "He was really into finding things out. He just wanted to know."