Two former Iowa State University runningbacks died Sunday. Dexter Green, an all American tailback for the Cyclones in 1978, died in Columbus, Ohio after a battle with cancer. He was 46. Green played for Earl Bruce from 1975 to 1978 and set the school’s all-time career rushing mark that was eventually topped by Troy Davis. He helped lead the Cyclones to a Peach Bowl berth in 1977 and a spot in the Hall of Fame Bowl a year later. Green died, the same day former Cyclone running back Ennis Haywood died in Dallas.Haywood began vomiting in his sleep early Saturday morning and died on Sunday after the family chose to discontinue life support. Further tests will be conducted to determined what killed Haywood after an autopsy failed to show a cause of death. Haywood spent last season on the practice squad for the Dallas Cowboys and took part in the Cowboys’ three day minicamp last week.