Chicago Police Superintendent Speaks on Heath Issues | UPDATE

Updated at 9:33 a.m. Jan. 28

Chicago Police Superintendent Eddie Johnson on Friday evening confirmed that he is on a waiting list for a kidney transplant, but denied reports that he has diabetes.

After falling ill during a press conference on Friday morning, Johnson was taken to Christ Hospital for evaluation. Later in the day, Johnson gave another briefing to discuss his health.

"For 32 years, I've been treated for a kidney condition that does not affect my ability to live a normal life," said Johnson, adding that it also does not affect his ability to do his job.

Johnson said he is not on dialysis. Once he does undergo the planned kidney transplant, Johnson said he expects to be back to work in three to five weeks.

Johnson's kidney specialist as well as the director of the Gift of Hope organ donor network and Mayor Rahm Emanuel also spoke at the Friday evening briefing.

The 56-year-old top cop said the Friday morning incident was unrelated to his kidney condition.

"This morning, I took my blood pressure medicine on an empty stomach," he said. "... I got light headed and was taken to Christ Hospital" for evaluation.

On Friday afternoon, Chicago police spokesman Anthony Guglielmi said Johnson was "feeling better," adding that he walked to his car on his own and was talking and alert -- but would go to a hospital to be checked out.

A Chicago Tribune reporter Tweeted video that appeared to show Johnson fainting as Mayor Rahm Emanuel spoke on Friday morning. Emanuel could be seen helping Johnson sit down.

Guglielmi said Johnson felt "light headed" during the press conference and did not lose consciousness. "He was coherent and will go to an area hospital for examination," Guglielmi said via Twitter.

The Friday morning press conference was scheduled to discuss "state-of-the-art, data-driven technology," including gunshot detection to help fight gun violence in the Englewood and Harrison districts, Guglielmi said.

Johnson was officially named to the superintendent position in March 2016 following the firing of Garry McCarthy over the Laquan McDonald shooting scandal. Sources reportedly told NBC 5's Mary Ann Ahern that Johnson disclosed his illness before he was hired for the job.

Earlier this month, the U.S. Department of Justice released the results of an investigation that found what it called a "pattern of civil rights violations" by Chicago police.