Sara Lance's killer

This unnamed person is an archer and the murderer of Sara Lance, who she knew.

Biography
Almost nothing is known about this individual including his name or motives, but what is known is that he had a previous affiliation with Sara Lance/The Canary. In 2014 Sara returned to Starling City in search of Malcolm Merlyn under orders of the League of Assassins, but this unseen person appeared on the rooftop much to Sara's confusion and shot 3 arrows into her killing her as she fell off the roof.

After learning of her death, Oliver Queen/The Arrow began searching for Sara's killer and Simon Lacroix/Komodo, who was on a killing spree of his own, was the prime suspect but he protest his innocence and Oliver confirmed Lacroix's innocence being elsewhere at the time. Nyssa al Ghul arrived in Starling City and confirmed Sara's mission in hunting Malcolm which made him the next main suspect, which was only further suspected due to Malcolm returning to Starlings. However when confronting the Dark Archer he repeatedly claimed that he didn't murder Sara but told Nyssa that her father Ra's al Ghul doubted Sara's loyalties, and previously disapproved of her relationship with Nyssa and believes he murdered Sara. Later Ra's tells Nyssa that he cares not for Malcolm killing Sara but for causing the Undertaking, strengthening Malcolm's claim. John Diggle briefly suspected Carrie Cutter/Cupid of being Sara's killer but Oliver dismissed it as she was dressing her victims up like the Arrow and used heart shaped spears on her arrows.

Abilities:

 * Skilled Archer: This person was skilled in archery being able to quickly shoot three arrows in Sara her chest.
 * Stealth: This person was skilled in stealth, being able to approach Sara who only realized her/his presence when he/she called her.

Trivia

 * Suspects of this man's identity include Malcolm Merlyn and Ra's al Ghul.
 * Given that Sara knew him it is very likley to be Ra's, but it's unknown if Sara ever met Malcolm. However this individual did use black arrows which are Malcolm's trademark.
 * This individual knew Sara as she said "What are you doing here?" when she saw him, but it is currently unknown how she knew him or why he wanted her dead.