"Arrow" season 3, episode 6 spoilers hint that Sara's killer could be revealed as Felicity and Roy figure out his dreams.

In the last episode, Roy Harper dreamt about Sara Lance getting murdered. But the dream took turn for the worse when he realized that Sara died by his own hands. Now Roy is trying to figure out if the dream is true or not, said the "Arrow" season 3, episode 6 spoilers.

Roy is not among the suspects in Sara's death, as it was generally attributed by the team to Malcolm Merlyn or one of the killers from the League of Assassins. But Merlyn already denied his involvement and even swore on Thea's life that he didn't kill Sara,w hich seemed to appease Oliver.

However, Bustle is convinced that Roy killed Sara and that his dream was a suppressed memory.

This could also be the reason why Roy is having trouble with sleeping.

"He did kill Sara, but it wasn't of his own free will. Let's not forget that Roy was once injected with the Mirakuru serum, which has been known to have some pretty powerful side effects," the site said.

"What if it can do more than just make the person superhuman. What if it allows you to be controlled somehow if used properly?"

"Arrow" season 3, episode 6 spoilers can be gleaned from the synopsis which reads: "After a body is found strung up in the Wildcat gym, Ted Grant (J.R. Ramirez) becomes the main suspect. Oliver (Stephen Amell) and Laurel (Katie Cassidy) argue over Ted's innocence."

"Meanwhile, in flashbacks, when Maseo (Karl Yune) needs Oliver to remember where an informant for China White stashed key information, he asks Tatsu (guest star Rila Fukushima) to help jog Oliver's memory. Roy (Colton Haynes) shares a secret with Felicity (Emily Bett Rickards)."

The episode is written by Erik Oleson and directed by Peter Leto.