Cook County Sheriff’s Police are advising families who were patients of a local pediatrician who took his own life last year to review their vaccination information with their current doctors.

Dr. Van Koinis, whose practice was at 3830 W. 95th St., in Evergreen Park, committed suicide last September in a Cook County Forest Preserve in Palos Township.

According to a news release from sheriff’s police, he left a suicide note that “raised questions about the record keeping of vaccinations at his medical practice.”

Investigators found that determining who received vaccinations and who did not was unclear due to problems with record keeping.

Information suggests that in some cases, Koinis did not provide vaccinations to children after their parents requested he not administer them. He then provided documentation that the child was given a vaccination.

“Out of an abundance of caution,” the news release said, former patients are advised to discuss this situation with their current physicians and inquire about methods to test for prior vaccinations.

According to the Illinois Department of Public Health, state law requires certain immunizations for children and adults enrolled in childcare, school or college.

According to his obituary, Koinis worked out of Advocate Christ Medical Center and Little Company of Mary Hospital.

Sheriff’s police said he mostly served patients on the Southwest Side and nearby suburbs.

He had been licensed to practice in Illinois since 1991.

Anyone with information about Koinis is encouraged to call Cook County Sheriff’s Police at (708) 397-6366. Inquiries about personal or family medical records can be made at (630) 670-1673.

The investigation is ongoing, authorities said, and the Illinois Department of Public Health has been notified.