In the second movie Megatron killed him
Megatron
Optimus Prime is the leader of the Autobots (the good guys). He is also the decedent of the Prime brothers who's mission is to protect Earth against the decepticons.
Sentinel Prime is a bad guy, he is killed by Optimus Prime after teaming up with Megatron to save Cybertron. Megatron who is being humiliated by Sentinel decides to team up with Optimus and eventually kills him.
yes ,sentiniel prime dies when optimus kills him because he betrayed the autobots.
Yes - Optimus Prime kills him.
optimus prime kills him
in the book/comic yes they are not in the movie
Scorned Love Kills - 2012 Sub-Prime Murder 1-19 was released on: USA: 26 May 2012
ironhide gets killed by sentinal prime. 2 dreads get killed by mirage and bumblebee. ironhide and sideswipe kill another 2 dreads but ironhide was badly damaged in th process. soundwave and a barricade looking decepticon kills que (a.k.a. wheeljack). optimus kills the robotic worm. optimus kills shockwave. sam kills starscream. bumblebee kills soundwave and the barricade looking decepticon. laserbeak kills numerous people who knows alot about the ark. optimus kills megatron. and megatron kills sentinal prime.
Yes, Optimus Prime kills him in the final battle
in the novel and comic sentinel prime and megatron go to cybertron and rebuild it in the movie megatron damages sentinel prime then optimus kills megatron then sentinel prime
in the movie prime almost was killed by sentinel but mega tron got mad because he wanted to kill prime so mega tron killed sentinel first then he tried to kill prime but prime ( as always) kills megatron.