A 22-year-old man (arrested on suspicion of murder) and a 34-year-old woman (arrested on suspicion of assisting an offender) were bailed until June.
A 20-year-old man (arrested on suspicion of murder) remains in custody.
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New criminal sanctions for those who fail to protect children from sexual exploitation are at the heart of new measures to be introduced.
Student Charlie Mann was jailed for 16 months for the attack on his mother at their family home while high on Meow Meow.
Monday night's weather for the east of the region