Reverend Allastair is a church official and the leader of a candlelight vigil for a previously unidentified murdered girl nicknamed "Cherish Doe". he addressed her as such while reciting a blessing for her, with numerous people in attendance after details of her murder were leaked to the media.
Detectives attended for a stakeout just in case her killer would arrive. Instead, Violet Tremain arrived dreading "Cherish" was her missing daughter Nina. She wasn't and instead was identified as another missing child, Susie Marshall. The cases were connected and committed by the same perp, Terry Jessup. Since Nina was still alive, Jessup gave up her location when Violet pleaded for him to care enough for Nina to be alive. (SVU: "Dolls")