Android #14
Movie #7 - Killed by Trunks

Android #15
Movie #7 - Killed by Vegeta

Android #16
Cell Saga - Killed by Cell

Android #17
Cell Saga - Absorbed by Cell

Android #19
Android Saga - Killed by Vegeta

Android #20
Android Saga - Killed by #17

Babidi
Buu Saga - Killed by Majin Buu

Bardock
Pre Dragonball - Killed by Frieza along with the rest of the Saiyan race

Bibidi
Pre Dragonball - Killed by Kaioshin

Bubbles (Kai's monkey)
Cell Saga - Died when Cell Self Destructed on King Kai's planet

Burter
Frieza Saga - KOed by Goku, killed by Vegeta

Buu
Buu Saga - Killed by Goku's Genki Dama

Cell
Cell Saga - Killed by SSJ2 Gohan

Chaozu
Dragonball - Killed by Piccolo Daimoa
Saiyan Saga - Psycho Attacked (kamikaze attack) Nappa in an attempt to destroy him

Chichi
Buu Saga - Turned into an egg and stepped on by Buu

Dabura
Buu Saga - Killed by Majin Buu

Dodoria
Frieza Saga - Killed by Vegeta

Frieza
Frieza Saga - Killed by Goku
Movie #12 - Killed by Gohan

Dende
Frieza Saga - Killed by Frieza

Goku
Saiyan Saga - Makankosappoed by Piccolo
Cell Saga - Died when Cell self destucted

Gohan Sr.
Pre Dragonball - Stepped on by Oozaru Goku

Gohan
Buu Saga - Killed by Buu

Goten
Buu Saga - Killed by Buu

Gregory
Cell Saga - Died when Cell self destructed

Guldo
Frieza Saga - Killed by Vegeta

Jeice
Frieza Saga - Killed by Vegeta

Kai of the North, King
Cell Saga - Died when Cell self destructed

Kame (Muten Roshi)
Buu Saga - Killed by Buu

Krillin
Dragonball - Killed by Tambourine
Frieza Saga - Killed by Frieza
Buu Saga - Killed by Buu

Nappa
Saiyan Saga - Killed by Vegeta

Piccolo Daimoa
Dragonball - Killed by Goku

Piccolo Daimoa Jr.
Saiyan Saga - Killed by Nappa
Buu Saga - Killed by Buu

Raditz
Saiyan Saga - Makankosappoed by Piccolo

Recoome
Freiza Saga - KOed by Goku, killed by Vegeta

Tienshinhan
Saiyan Saga - Shot a suicide blast at Nappa in an attempt to destroy him
Buu Saga - Killed by Buu

Trunks, Chibi
Buu Saga - Killed by Buu

Trunks, Future
(During the original timeline) Killed by Cell
Cell Saga(In this timeline) - Killed by Cell

Vegeta
Frieza Saga - Killed by Frieza
Buu Saga - Self destructed in an attempt to destroy Buu

Videl
Buu Saga - Killed by Buu

Yamcha
Saiyan Saga - Killed by a kamikaze Saibaman

Zarbon
Frieza Saga - Killed by Vegeta