"I understand that this is an extremely difficult time for you...I was the individual who placed the 911 call as well as the individual who spent final moments with Aliza Sherman. I have followed this story very closely since that tragic afternoon, and am as angry as you that an arrest has not been made, nor have any answers been given."
Sherman was stabbed to death 11 times near her divorce attorney's office on a Sunday afternoon.
"It hurts my heart to know that her family and friends are suffering so terribly during this time...I did not personally know Aliza, but her murder has deeply affected me ever since that dreadful Sunday afternoon," Shepherd continued.
He has not spoken with the media and vows not to until he speaks with Sherman's family.
"I am reaching out to you now, through this brave Facebook page, to offer details of what transpired that extremely sad afternoon. I have not been able to talk about this with anyone, but would like to attempt to speak with you...I cannot stand by and continue to watch you suffer through this terrible time."
Shepherd's post ended with, "Like you, I DEMAND justice served for the murder of Aliza Sherman."
A $25,000 reward is being offered for information that leads to the arrest of the man who murdered the Cleveland Clinic nurse and mother of four. Cleveland police recently released surveillance video of the suspect, but his face was not clear in the video.
Anonymous tips can be made by calling 216-623-5464, 216-252-7463 or online