Start a process in Linux Unity

I am trying to start a process in Linux using below c# code in mono developer for Unity in start function.

Process.start(filepath);

Results as checked in task manager of linux
1. Process starts but ends in 3 secs with Memory shown as 'N/A' in task manager during the 3 secs and Status as 'Zombie'

Note : The process works fine when executed from terminal or when double clicked or when run in Unity independent C# project