Before the Theta Delta Chapter became Phi Mu, as it is known today, it was called the Delta Phi Delta sorority. The Delta Phi Delta sorority was founded in 1967, at Spring Hill College. Twenty years later in 1987, the sorority was no longer to be simply a local sorority. As the sorority began looking at national sororities, they found that several were interested in establishing a chapter at Spring Hill College. After the members of the Delta Phi Delta sorority affiliated with Phi Mu Fraternity, they changed their colors from blue and green to pink and white. As a result, Phi Mu became the second national sorority on Spring Hill's campus. On January 18, 1987, twenty-one new members were initiated into the Phi Mu bond of sisterhood. Later in the year, the Theta Delta chapter of the Phi Mu Fraternity expanded to over fifty ladies. In 1987, Maggie Cunneen was the first to hold the position of President in Phi Mu.
Even though Phi Mu was the newest addition to Spring Hill, the fraternity flourished greatly. Phi Mu was represented in many clubs and organizations. Phi Mu had representatives on the Inter-Sorority Council, which became Panhellenic Council soon thereafter. That year, Phi Mu became the winners of the Sigma Chi Derby Days fundraising event. Phi Mu members helped to raise over four thousand dollars. Phi Mu also aided the less fortunate though their philanthropy project HOPE (Health Opportunity for People Everywhere), which the Delta Phi Delta sorority had begun in 1963.
From year to year, Phi Mu members at Spring Hill College carry on the tradition of being active on campus, excellence in scholastics, and promoting the bond of sisterhood. Phi Mu offers social, academic, and spiritual challenges for the women of the sorority, so that they may uphold its traditions and values. This well-rounded group of women contributes to an organization that places utmost importance on service, scholarship, and sisterhood.