Rohrssen, 54, joined John Calipari's staff with the Wildcats last May. He had also served as an assistant at Pittsburgh and St. Francis (NY), his alma mater. He was the head coach at Manhattan from 2006 to 2011 but managed only one winning season.
Rohrssen, nicknamed "Slice," is known as a recruiter and has deep ties to the New York area. A Brooklyn native, he still maintains a home in the Bronx, according to Zagoria.
St. John's hired Mullin last month after firing Steve Lavin. Mullin, the Red Storm's all-time leading scorer, has never before held a coaching job.
- Dan Gartland