Another Boat Tragedy involving Texas students .South Grand Prairie High School graduate Lisa Chung died .

A South Grand Prairie High School graduate died Tuesday, three days after she and other students jumped from a sinking tour boat in Mexico.

Lisa Chung, 18, apparently was trapped under a rescue vessel in the chaotic scene about 200 yards off Cancún. By the time rescuers pulled her to the surface, the honor student had suffered heart and lung failure.

The captain of the Sea Star ordered a half-dozen North Texas students and more than 100 other passengers to jump into the ocean when the boat began sinking Saturday afternoon. Ms. Chung and another student, Loren Dailey, bobbed toward the surface as another boat slid over them.

"We had life vests on so we were coming back up, and the next thing we know when we come back up there was a boat on top of us," Ms. Dailey said Tuesday. "And not like pinning us down, but I mean, that's all I could feel. I believe it's a rescue boat that came in and didn't know we were underneath the water."