Medical examiners are focusing on the possibility of a heart abnormality in their investigation into the sudden death of 28-year-old Atlanta Hawks center Jason Collier, according to his agent.

"They are looking at the heart," agent Richard Howell told ESPN.com. "They preliminarily see an abnormality, but they still have a lot of work to do. It could be anything, and they're looking at everything."

Howell said he had received no further specifics on what particular type of heart abnormality Collier apparently had. Collier died early Saturday after experiencing trouble breathing at his home. His wife administered CPR, but Collier was pronounced dead on arrival at a suburban Atlanta hospital.

Forsyth County coroner Lauren McDonald said it could take up to six weeks before the autopsy is finalized. Pathologists and technicians are conducting numerous tests and reviewing Collier's medical records from his time with the Houston Rockets and Hawks as part of their investigation.

Hawks spokesman Arthur Triche said the team had been asked by Collier's family to defer any comment until after Collier's funeral Wednesday.