I have a question about Bob Kirkland. He´s definitely death and I don´t know or it escaped myself notice.

Why Kirkland Killed Jason Lennon? I don´t understand. He could have some information....I dont know if it is because he didn´t want to Jane get some information from Jason earlier and he wanted to be the only one who reveal real identity of Red John and could kill him. But it doesnť make any sence for me.

Has any one any answer which could satisfy me?