Vega was killed by a mobster with an assault rifle - it's obvious.
Cash was killed, respectively, and also obviously - by a maniac.
Lizard was drugged by a doctor.
Clues:
"In addition, a crushed token with the inscription 'invisibility' was found on the body." - a clue pointing to the maniac who killed Cash.
"One of the bullets pierced the intestines, the other the heart." - possibly a clue pointing to the mobster.
Question:
What the hell was Cash doing near Werewolf's house?
Possible answer:
Cash was a cop. The maniac was after Werewolf, and Cash was protecting her. Apparently, he didn't survive... How likely is it that the cop was protecting the very target that the maniac was after? 1 in 11, not very encouraging. We need to look for another option...
Now I'll think based on the clues.