CBBC star Mark Speight is leaving the TV show SMart after the death of his girlfriend, Natasha Collins, earlier this year.
The presenter discovered Miss Collins' body at their home on 3 January.
He was arrested, but police later said he wasn't being treated as a suspect over her death.
In a statement, Mark said he was still so upset about his girlfriend's death he felt he couldn't appear in the next series of SMart.
He said: "The tragic loss of Tash has affected her family and me very deeply.
"Therefore I feel unable to commit to the next series."