A SERIOUS case review may be held over the murder of little Derin Jordon as authorities began to look into whether any warnings were missed about her half-brother Jed Allen, pictured.

Derin and her mother and father, Jan Jordon and Phil Howard, were found stabbed to death in their home in Vicarage Road, Didcot, on Saturday.

Yesterday it emerged Allen, 21, had texted friends in the wake of the killings but police have not said if that was what made them go to the family’s home.

The manhunt for Allen, a 21-year-old gardener named as the only suspect for Derin’s, his mother’s and her partner’s murders, ended on Monday evening when a body believed to be his was found in woodland off Marston Ferry Road.

He often posed on social media with weapons and had lived with his mother and half-sister for periods.

Oxfordshire Safeguarding Children Board said it would consider information regarding the case before deciding whether to launch an independent review.

A Serious Case Review takes place after a child dies or is seriously injured and abuse or neglect is thought to be involved. The Independent Chairman of the OSCB Maggie Blyth said: “The death of any child is extremely sad and in these circumstances it is particularly tragic. Once all information is made available to the OSCB, I will be in a position to consider whether an independent SCR regarding this little girl’s death should be commissioned.”

The results of the post-mortem examinations of the victims are expected to be released today, but police believe they were stabbed to death.

It is not known when the cause of death of Allen will be released. Police have refused to be drawn on comment that he was found hanged.

Vicarage Road was re-opened yesterday, but a cordon remained in place around the house and police spokeswoman Connie Primmer added: “The investigation continues to be focused on establishing the circumstances of the deaths.”

Allen’s 21-month employment stint with Didcot Town Council as an apprentice gardener will also be discussed in the coming weeks.

Didcot North East councillor Steve Connel said: “It will be something that will be discussed and looked into.

“From discussions I have had with people it doesn’t seem like anything was done incorrectly and that processes were followed.”

He added: “But as with every issue you would do a review afterwards to make sure everything was done correctly.”

Allen was in the process of studying for a Level 3 apprenticeship in Horticulture at Abingdon and Witney College having previously completed his Level 2 last year .

The college’s student services team will be on all college campuses during half-term week offering support.

College principal Teresa Kelly said: “This is clearly a very tragic event and our thoughts are with all of the victims and their families. “Support is available for any of our students and staff who have been affected by the events of the past few days.”

Thames Valley Police initially believed Allen worked as a groundsman for Oxford University, but this was yesterday denied by the University.