For most of the couple's marriage, they owned a farm outside of Terre Haute, but spent much of their time at their 1,300-acre (526 ha) ranch in Wyoming.

Only four weeks after this, Elmer was shot multiple times and killed by Guy Trollinger, the family's horse trainer and Mari's alleged boyfriend, after an argument at Elmer and Mari's ranch in Terre Haute late at night on the day of that year's Indianapolis 500.

When Mary F. Hulman's health began to decline, she retired and was named chairman emeritus, a position she held until her death in 1998.

Shortly after the 2016 Indianapolis 500, Mari was facing declining health and was elected chairman emeritus of the family companies.

The college maintains the Mari Hulman George School of Equine Studies, founded in part due to her love of horses.