Mason Bridge

Mason Bridge was a Pulitzer-winning journalist who works for the Central City Picture News. His editor-in-chief, Eric Larkin, made him watch over newbie Iris West, despite him not wanting to. He was killed by the Reverse-Flash because of his investigation of Harrison Wells.

Biography
After Iris West began at the Central City Picture News, she attended a meeting, where Mason greeted her. Eric Larkin assigned him as her "nanny", much to his disdain. Iris later tried to small talk with Mason, but he told her that he was off to follow up on a lead, whereas she had to follow the assignment Larkin had given her. She attempted to vocalize her passion for journalism, but Bridge mocked that it was only as she wrote a blog, similarly to his own mother. They both later attended a press conference held by Harrison Wells, who confessed that he had actually been forewarned about the possibility of S.T.A.R. Labs' particle accelerator's malfunction. Mason attempted to ask a question, but Wells focused on Iris, who reiterated her partner's question in regards to him building another particle accelerator. Surprised at her sudden finesse, Mason inquired where it had come from, with her mockingly replying that it was "gumption", as he had previously suggested.

Mason continued to find S.T.A.R. Labs and their activity fishy and intended to do some more digging. He managed to get hold of the lab's blueprint, and was not shy to share his skepticism about the timing of Dr. Wells's press conference to Iris. When a military shooting took place at CC Jitters, he contacted the Army's media relations division and inquired on whether the soldiers were permitted to operate on United States soil like the way they did, though did not receive a satisfactory answer. Mason was able to identify Caitlin Snow, who was present during the shooting; remembering Iris saying that she knew some of the leftover scientists from S.T.A.R. Labs, he asked her if Caitlin happened to be one of the people she knew. His question was crucial for the fact that Caitlin didn't mention the shooting when Iris met her, brought doubts to Iris' belief about S.T.A.R. Labs.

Due to his relentless investigation and eventual attempt on publishing an article about Harrison Wells' involvement in Simon Stagg's murder, Mason was killed by the Reverse-Flash, who impaled his arm through Mason's torso.

Behind the scenes

 * In an erased timeline, Mason tells Iris that Wells is possibly responsible for Simon Stagg's disappearance. Which leads to Iris asking Barry, Barry asking Caitlin and Cisco, which leads to Cisco investigating Wells, uncovering that he's the Reverse Flash and getting himself killed. Fortunately due to Barry changing the time continuum he stopped Mason from getting the word out.
 * Mason's name is similar to that of a DC comic book character, Mason Trollbridge, a supporting character in The Flash comic book series during the late 80s and early 90s, though Trollbridge wasn't a journalist but a retired truck driver and carpenter. He was also Wally West's neighbor and friend as well as the former sidekick to the vigilante known as the Clipper.