Another post in the PowerShell Box of Tricks series. There are much better ways of doing this I admit but as you can do it with PowerShell I created a function to do it.
Create a Server Object and notice that there is a Method named EnumProcesses by piping it to Get-Member and then look at the Properties and Methods of EnumProcesses
You can also find a Method called KillProcess on the Server Property so I asked a Yes/No question using Windows Forms. You can find much more detail on that here
All you need to supply is the spid
The code is here Show-SQLProcesses