Whoa take a breather man.
There's ways it could still certainly be on the laner's fault. For example, what if a Shen Top still killed the enemy, but missed a point blank Taunt he had no business missing? That then lead to the Jungler's death since they were expecting it to land. Just a random example but there's a billion of 'em.
If you're this upset, I recommend getting some fresh air. I mean that in the literal sense; sometimes it's nice to walk outside and readjust, stretch a little, clear the mind, breathe in and out some. Taking yourself away from the situation (post game of course, don't AFK mid-game please) and putting yourself in a new setting, even if briefly, can really help relax you.