A 13-year-old central Kentucky basketball player has died after collapsing during the first day of practice.

Grayson County Coroner Joe Brad Hudson says seventh-grader Keith Michael Walker collapsed around 4 p.m. CDT Tuesday at Grayson Middle School.

Hudson says preliminary autopsy results indicate Walker died of apparent sudden cardiac death. Grayson County schools Superintendent Barry Anderson says although it was the first day of practice since school started Aug. 1, Walker had practiced during the summer with the team.

He says Walker had passed all his school physicals and sports physical.

Anderson says players are allowed water anytime they want it and that the team was about 30 minutes into practice inside an air-conditioned gymnasium with an experienced coach when Walker collapsed.