Yes count dooku died in episode 3He was killed by anakin skywalker
Count Dooku is killed in the beginning of Episode III by Anakin Skywalker cutting off his head.
No Count Dooku does not die Episode II : Attack Of the Clones, Count Dooku injures Anakin major and Obi ~ Wan minor, Count Dooku is killed in Episode III By Anakin for his arm
anakin cuts off dooku's hands and then he slice him in the head
According to Wookieepedia, Count Dooku is 1.93 meters tall.