Dad arrested over murder of his 4-year-old son whose remains were buried in their backyard

The biological father of 4-year-old Aiden Bevins was arrested on suspicion of second-degree murder and first-degree manslaughter after police in Aberdeen, Washington, found the boy's remains buried on the father's property - (Supplied)

The biological father of a 4-year-old Washington boy whose body was found buried in a relative's backyard has been arrested in connection with the child's death.

Police in Aberdeen, Washington, arrested the 36-year-old man on suspicion of second-degree murder, first-degree manslaughter, unlawful disposal of human remains, and making false statements to a public servant, according to KING 5.