15 Times MCU Heroes Actually Killed
14. The Guardians Exploded Ronan - Guardians Of The Galaxy
By virtue of being criminals initially, The Guardians of the Galaxy all have rap sheets that include some pretty grievous crimes, but not all of them are killers when they come together. Gamora and Drax both have murder on their criminal records, but Rocket and Groot only have mercenary activity, prison escape, GBH and "public drunkenness" in the case of Rocket and Peter Quill's worst crime is having sex with members of a royal family.
By the time the film is over, only one of those team-members can claim not to have killed someone and that's because he - Groot - is dead at the time.
At the end of the movie, with Ronan's destruction of Xandar thwarted, the remaining Guardians stand up to him and use the power of their friendship to harness the Power Stone and send the Kree terrorist to his maker. It's problematic in terms of the lore of the Infinity Stones, but it definitely leaves a mark.