[Your Name] [Your Address] [City, State, ZIP Code] [Email Address] [Phone Number] [Date] [Recipient's Name] [Recipient's Address] [City, State, ZIP Code] Subject: Update to Witness Verification — [Case Number/Incident Details] Dear [Recipient's Name], I hope this letter finds you in good health. I am writing to provide an update regarding the witness verification for the [case number/incident details] in [City], [County], Illinois. As an essential component of our ongoing investigation, it is crucial to maintain accurate and up-to-date witness information. Firstly, I would like to express my gratitude for your previous cooperation in confirming the authenticity and credibility of the witness named [Witness Name]. Since our last communication, there have been significant developments that require an update to his/her contact information. Please find the updated details below: Witness Name: [Updated Witness Name] Address: [Updated Witness Address] Contact Number: [Updated Witness Contact Number] Email Address: [Updated Witness Email Address] Kindly update your records accordingly to ensure seamless communication and accessibility to the witness during the course of the investigation. Furthermore, I would also like to bring to your attention the identification of two additional witnesses who may provide valuable insights into the incident [or relevant case]. The details of these new witnesses are: 1. Witness Name: [New Witness 1 Name] Address: [New Witness 1 Address] Contact Number: [New Witness 1 Contact Number] Email Address: [New Witness 1 Email Address] 2. Witness Name: [New Witness 2 Name] Address: [New Witness 2 Address] Contact Number: [New Witness 2 Contact Number] Email Address: [New Witness 2 Email Address] We kindly request your cooperation in verifying the details of the aforementioned witnesses as soon as possible. Any information you can provide regarding their credibility, availability, or any other relevant details would be greatly appreciated. Should you have any questions or require further clarification, please do not hesitate to contact me at the provided contact details. Your prompt attention to this matter is highly appreciated, as it will aid us in expediting the investigation process. Thank you for your continued support and cooperation in resolving this matter. We look forward to a favorable resolution in due course. Yours sincerely, [Your Name]