In the sequel's Dark Side Ending, the last thing Starkiller sees before he dies is Juno's dead body.
A scene in the sequel's novelization, where an unconscious Starkiller remembers his mother's Heroic Sacrifice to save her family and as many Wookiees as possible from Trandoshan slavers.
Behind-the-scenes notes give the fate of one of the failed Starkiller clones:
Lead Cloning Technician: Curious. One of the more stable test subjects began weapons training today. A training droid shorted out and wouldn't project the training program. He was having no problem cutting down all the other droids, who appeared to be living human beings, but he refused to attack the damaged droid. Flat out refused. Instead he smiled at the droid, and then started mumbling over and over: "proxy, proxy, proxy".
From Bad to Worse: That droid proceeded to brutally beat the clone, who couldn't bring himself to fight back against the machine that resembled Starkiller's oldest friend.
The scene where Starkiller enters the Dark Side Cave and sees a vision of Juno. He tries to embrace her, but she dissolves into smoke. He clutches his chest, his heart breaking.
While making his way through the cloning facility in the second game, Starkiller starts hearing Juno and Kota's voices tormenting him. By the time he manages to shake off the hallucinations, Starkiller's on the verge of a breakdown.
"Juno": Who are you?
Starkiller: Juno, it's me!
"Juno": You're a monster, a thing.
Starkilller: [on the verge of tears] Juno, please!
"Kota": You're Vader's puppet. Just a body filled with the memories of a dead man.