Why Missouri football player Aaron O’Neal died is still a mystery. Boone County Medical Examiner Valerie Rao said Thursday that an initial autopsy didn’t reveal any reason why the 19-year old linebacker died hours after a workout at Faurot Field earlier this week.

According to Rao, O’Neal’s death was not the result of foul play, trauma or infectious disease. Even further, she added that O’Neal did not look dehydrated.

Further tests—such as toxicology, heart and brain tests—must still be conducted for the autopsy to be complete. Those tests could take at least six weeks.

O’Neal took a red shirt during his freshman year and was hoping to see his first action as a Tiger in 2005. As a red shirt freshman, O’Neal had already moved up to third-string on the depth chart at middle linebacker. He was also a prep star at Parkway North High School in suburban St. Louis, where he excelled as a running back.

Memorial and funeral services were announced on Thursday. The memorial service will be on Sunday from 1-6PM at Archway Memorial Chapel in Hazelwood, Missouri and O’Neal’s funeral will be at 10AM on Monday at Westside Missionary Baptist Church in St. Louis.