DeleteAadObject.ps1

Function DeleteUser
{
    param(
        [String] $token,
        [String] $upn
    )    
    $headers =  @{"Authorization" = "Bearer $($token)"; "Content-Type" = "application/json"}
    $deleteUserUri = "https://graph.windows.net/<your.tenant.domain>/users/$($upn)?api-version=1.5"
    $userDeleteResult = Invoke-WebRequest -Uri $deleteUserUri -Headers $headers -Method Delete
    $userDeleteResult
}