India, April 27 -- The voice of Cole Tomas Allen, the suspect in White House Correspondents' Dinner shooting, was heard in a resurfaced video on social media.

Allen, 31, a teacher and game designer from California, was featured in a news segment almost ten years ago, demonstrating a prototype he developed to enhance the safety of wheelchairs.

In 2017, Allen was a student at Caltech when he participated in an interview with ABC7 in Los Angeles during the "Aging into the Future" conference.

In the re-emerged footage, Allen discusses the creation of a prototype for an emergency brake designed for wheelchairs.

He further explain his invention, saying: "The wheelchair brakes tend to lock the wheels, but don't actually lock the chair to the...