A veteran Grayslake police officer under investigation for possibly violating departmental policies resigned this week, authorities said Wednesday.
Sgt. David Williams’ resignation ends the department’s internal investigation, but the Lake County state’s attorney’s office is still looking into the matter.
“We are investigating him for possible criminal activity as a police officer,” said Assistant State’s Atty. George Strickland. “I imagine that we will conclude our investigation in the near future.”
Grayslake police began investigating Williams in November for possibly violating department rules, said Village Manager Mike Ellis. Williams was accused of making inappropriate transmissions on the department’s radios, Ellis said.
But while the department was investigating those allegations, they learned Williams may have been involved in some criminal activities, and the state’s attorney’s office was asked to investigate, officials said. They declined to elaborate.
In December, Williams was placed on paid administrative leave.
On Monday, Williams sent an e-mail to department officials, saying he was resigning, Ellis said.
“He’s always been a good officer for us over the years,” Ellis said.
Williams could not be reached for comment.
The Grayslake Police Department has 32 full-time officers and two part-time officers, Police Chief Larry Herzog said.
During his 10-years on the force, Williams rose to a position where he supervised a shift of officers, Herzog said. He was in charge of the department’s firearms training and ran the field training program for recruits.
Williams also was recognized for making the most DUI arrests in Lake County in 2003, officials said.
No other officers are being investigated in connection with Williams’ case, Herzog said.
“We are all saddened by this, but we all realize that life goes on,” Herzog said. “We are moving forward from this. It hasn’t affected our mission and, we hope, our relations with the community.”




