Teenage killer Craig Mulligan showed the "hallmarks of a psychopath" in his interview with police, according to a body language expert.
Mulligan was just 13 when he killed five-year-old Logan Mwangi alongside stepdad John Cole, 40, and Logan's mum Angharad Williamson, 31.
His identity came to light on Thursday after he was sentenced to life detention with a minimum of 15 years and an anonymity order banning the press from naming him was finally lifted.
