Please solve the programming task below using a self-contained code snippet in a markdown code block.

You have n processes forming a rooted tree structure. You are given two integer arrays pid and ppid, where pid[i] is the ID of the ith process and ppid[i] is the ID of the ith process's parent process.
Each process has only one parent process but may have multiple children processes. Only one process has ppid[i] = 0, which means this process has no parent process (the root of the tree).
When a process is killed, all of its children processes will also be killed.
Given an integer kill representing the ID of a process you want to kill, return a list of the IDs of the processes that will be killed. You may return the answer in any order.
 
Please complete the following python code precisely:
```python
class Solution:
    def killProcess(self, pid: List[int], ppid: List[int], kill: int) -> List[int]:
```