The famous one of these is the California Freeway Chase/Suicide, I won't link to it, but it was a sad case all the way around.
Your talking about white dude in pickup truck with his dog that stopped on the freeway, got out of his car , grabbed a container of fuel went back in the cab , and then poured it all over himself and the dog and light his ass up? Then when the heat got to hot to handle he got out the cab in flames took off all his clothing , went back to his truck dick and asshole flairing grabbed a shotgun, put it under his chin and blew his head completely off

Is that the one your talking about