An extensive evaluation process has determined that McMorrow is medically incapacitated to participate in basketball at the collegiate level.
The Toronto, Ontario, native will remain enrolled at the University as he continues to pursue his bachelor's degree in broadcasting.
"We are very disappointed with the end result this has for Liam athletically, but because of the efforts and time spent over the last several weeks by all involved, we are excited that he is able to finish his academic career at Marquette," Williams said. "Liam and his family have been involved in this sensitive manner from the start and we are thankful his issue was detected when it was.
"We are grateful for Liam's contribution to our program over this past year and even though he will not be able to play for us, that will not change his involvement in our program in any other way," Williams added.
McMorrow, who redshirted in 2008-09 in his first year with Marquette after transferring from Durham College in Canada, did not appear in any games during his MU career.