Octopus - Delete LifeCycle using REST API

Remove-OctopusLifeCycle.ps1

#Change dll path accordingly
Add-Type -Path "C:\Program Files\Octopus Deploy\Tentacle\Newtonsoft.Json.dll"
Add-Type -Path "C:\Program Files\Octopus Deploy\Tentacle\Octopus.Client.dll"
Add-Type -Path "C:\Program Files\Octopus Deploy\Tentacle\Octopus.Platform.dll" 

#Connection data
$apikey = "YOUR-API"
$OctopusURI = "http://YourOctopusURL"
$headers = @{"X-Octopus-ApiKey"="$($apikey)";}

$endpoint = new-object Octopus.Client.OctopusServerEndpoint "$($OctopusURI)","$($apikey)"
$repository = new-object Octopus.Client.OctopusRepository $endpoint

#I.e "Lifecycles-2" (Open the lifecycle you want to delete from the Web UI and check the URL if unsure of this value)
$LifecycleID = "" 

Invoke-WebRequest -Uri $octopusURI/api/lifecycles/$LifecycleID -Method Delete -Headers $headers -Verbose