WESTERVILLE, Ohio (AP) — Police say a former doctor and university trustee who pleaded guilty to charges of tax evasion and running a pill mill in Columbus has been shot in an apparent home invasion.

The Franklin County Sheriff’s Office says 51-year-old Kevin Lake has been taken to the hospital and reported in critical condition.

Major Steve Tucker says Lake’s son called 911 Thursday morning and reported hearing gunshots after someone tried to break into the home. Tucker says the family had recently received a written threat.

Lake had pleaded guilty in January to evading $3.5 million in taxes and serving hundreds of patients daily at Columbus Southern Medical Center for prescriptions of oxycodone, hydrocodone and Xanax.

Lake resigned as Ohio University trustee on Jan. 21.

The shooting is under investigation.