I waited a few days to post this, because the source I read it in wasn't very reliable, but now it's in many different venues.

sad.
from the Chicago Sun Times:
JONATHAN BRANDIS DIES: Jonathan Brandis, star of the 1993-95 NBC series "seaQuest DSV," was found dead in his Los Angeles apartment Nov. 12. He was 27. Coroners identified his death as a possible suicide, but more tests are planned before a final ruling. Mr. Brandis starred in the recent film "The Year That Trembled."

From the child actors website A Minor Consideration

http://www.minorcon.org/brandis.html