The native of Rockford, Illinois, birdied his first playoff hole Sunday to claim medalist honors at the EKU Intercollegiate sponsored by Raising Cane's. Slattery and EKU's Bill Basham both fired a final-round 68 and finished at five-under par (205).
Slattery won the playoff to top a field of 94 golfers, including golfers from five other OVC schools.
The tournament win is the first for an SIUE player since 2013.
The 205 is the lowest 54-hole total of Slattery's career and the sixth-lowest in school history. Slattery tied the school record with a 64 in Saturday's second round.
The Cougars will play host to 16 other schools at the Derek Dolenc Invitational Sept 24-25 at Gateway National Golf Links.