So this guy gets himself lit and has sex (anal, not anal, I don't care) with a complete stranger and is embarrassed.
So he, (and possibly two other people) KILL this stranger.
Does the fact that this person is transgendered justify MURDER?
I disagree with you. It wasn't murder.
Imagine a woman who goes to a party with a friend and wakes up in bed next to him, naked. He laughs and says that he did her while she was stoned. She is furious at the deception and grabs the nearest object, a lamp, and bonks him on the head. He dies. Murder or manslaughter? It was an unwanted sexual encounter. My bet is that the gal gets off or pleads guilty to involuntary manslaughter.
Ditto for this situation. A pervert dresses up like a gal and runs around parties giving boys oral and anal sex like a hooker, except for free. The pervert is brazenly promiscuous. The pervert brags to others that he/she/it is fooling all the boys. So one of the boys, after hitching up his pants after the liason, gets snickers from someone else at the party that he just did a guy, not a girl. He finds two other dudes equally fooled. They grab the "it," pull him outside, force him to drop his pants, confirm that he has male anatomy, and then beat the sh-t out of him when he taunts them again.
I think manslaughter is the correct diagnosis here. The only other factor is that instead of confessing the crime of passion immediately after it happened, they drove the body into the mountains and tried to hide it.
"Does the fact that this person is transgendered justify MURDER? "
No but apparently teens throwing eggs at an armed man justifies murder according to the vigilante vultures in the egg throwing in another thread. I think the man in this story knew exactly what he was doing and is more disgusted that his sexual penchant was discovered and made public in court.