The 13-month old boy was sexually abused and murdered by his adoptive father, who was a former high school teacher

Carrie Johnson, Ellie Goulding and Olivia Colman are backing calls by almost 100,000 people for a 'thorough and transparent' probe into missed opportunities to save the toddler.

The 13-month old boy was sexually abused and murdered by his adoptive father, who was a former high school teacher