The Los Angeles County Coroner's office has determined that Bubba Smith died from acute drug intoxication which involved phentermine.
The LA Times reports that phentermine is a weight-loss drug. The Coroner's office also determined that Smith was suffering from heart disease and high-blood pressure. Smith had an abnormally large heart --nearly twice the weight of a normal heart -- and some of the vessels were blocked as much as 75 percent. All of these elements contributed to Smith's death earlier this year.
Bubba Smith played for Michigan State University, the Baltimore Colts, the Oakland Raiders and the Houston Oilers, before ending his football career in 1976.
Smith is best known to younger generations for his acting, especially his portrayal of Moses Hightower in six of the "Police Academy" movies.
Bubba Smith was 66.
Read more about phentermine's contribution to Smith's death here.