Origin
David Singh is the Crime Lab Director, for the Central City Police Department. He reports directly to Captain Frye, and is not pleased with having to take Barry Allen into his Lab on the Captain’s orders.
Major Story Arcs
The Dastardly Death of the Rogues
For more information see: The Dastardly Death Of The Rogues
Barry Allen is back working for the C.C.P.D. and Captain Fyre has put him under Singh’s charge. On his first day back Singh give him the case of the murdered Mirror Monarch. Then later Singh catches Barry looking though the Jason Hicks files, a case that had been closed and already went to trail. Barry explains that Jason’s mother came to him for help and accuses Singh of pretending to give a damn about his job.
Singh is going to argue back but James Forrest calls him to his computer. Singh had Forrest check the Mirror Monarch’s body for clues and Forrest found blood, that didn’t belong to the victim, on his glove. The blood matches Barry Allen, but instead of accusing Barry, Singh yells at him for contaminating the crime scene. He then belittles Barry saying, if he wants to accuse people of being sloppy he should make sure his cases are clean first.
Later Singh notices the Hicks files are missing and so is Barry. Unknown to Singh, Barry gave the file to Iris West Allen and she did some research and learned that the real murder was Rory Tork. Once Jason Hicks was freed Singh reexamined his job and realized he may have closed cases in haste. That’s why his first order back in the office is to reopen all closed cases from the past six month
Road to Flashpoint
For more information see: Flashpoint
David Singh has ordered reopening of every cases closed by his department over the last 6 months, and has ordered his team to work overtime, including Saturdays. He then puts Barry Allen on the possible death case of the Elongated Kid. Later when Patty Spivot returns to the Crime Lab to do Barry a favor, Singh gives her a hard time, but he’s happy she is there to help.
The New 52
After the DC Event Flashpoint, the entire DC Universe was altered into a five year timeline. Singh is shown to be the same person he was prior to the New 52 except for several significant details. Upon Barry Allen’s apparent death, Singh was put into a far more sympathetic light when he comforted Patty Spivot at his apartment. Singh is also secretly gay, being in a relationship with the ex-vigilante Pied Piper, who is a celebrated musician in Central City. Singh is shown to be a very good leader when Central City went under a black-out, dispersing his team out into the city to keep order and just as well getting his hands dirty in keeping the peace. Upon the Rogues battle with The Flash, Piper was injured and Singh was shown by his side during the fight.
Alternate versions
Flashpoint
For more information see: Flashpoint
In this alternate reality created by Professor Zoom, Singh is still head of the Central City Police Crime Lab, and he is one of the few people in Central City who believe Citizen Cold is really a murder and not a hero, all he needs is some cold hard evidence.
Other Media
The Flash
Captain David Singh (played by Patrick Sabongui) has made multiple appearances as the head of Central City’s police force. In the Arrow-Flash crossover episode “Flash vs. Arrow,” he mentions having a boyfriend, but doesn’t name him.