The father of missing chef Claudia Lawrence sang with The Missing People Choir on last night's Britain's Got Talent which moved viewers to tears.
Peter Lawrence, 70, was among an ensemble of missing people's relatives hoping to win the £250,000 prize to fund their appeals.
Supported by Kate McCann, mother of Madeleine McCann, the choir also includes Rachel Elias, the sister of missing Manic Street Preachers guitarist Richey Edwards.
The judges heard a rendition of I Miss You, a song penned by Peter Bozell, whose son Lee went missing nearly 30 years ago.
The piece also includes lyrics written by schoolgirl Alice Gross, who was murdered in 2014 aged 14.
Mr Lawrence praised judges Simon Cowell and Amanda Holden for their comments on the choir's performance when he said: "They just about made me cry. They were so supportive."
Miss Lawrence was last seen on March 18 2009 and reported missing the following day after she failed to turn up for a shift at work at the University of York.
Detectives believe the 35-year-old was murdered and in January, North Yorkshire Police announced the investigation into her disappearance has been scaled down.