Watch: Man in Wheelchair Killed by Hit-Run Driver

The family of a Long Beach man, struck by a hit-run driver while crossing the street in a wheelchair, joined police Wednesday in seeking witnesses who might identify the driver.

Relatives of Robert Diaz, 55, who succumbed to his injuries Monday, were making themselves available to the press to share information about their late family member Wednesday afternoon. At the same time, the Long Beach Police Department released to the media a surveillance video that shows, in grainy black and white, the car striking Diaz without seeming to brake.

Police said the fatal collision happened about 5:30 p.m. Sunday near Artesia Boulevard and Rose Avenue, as Diaz crossed Artesia Boulevard at Rose, and was struck by a car eastbound on Artesia.

"Diaz was transported to a local hospital by Long Beach Fire Department paramedics and initially listed in serious but stable condition," the department said in a press statement.  But Diaz died the next day.

"After the collision, a witness saw the suspect vehicle stop on Gardenia Avenue south of Artesia Boulevard, and get out of the car.  When the witness directed officers to that location, both the suspect and vehicle were gone" the statement continued. "The suspect vehicle is described as a silver 4-door sedan and the suspect is described as a male Hispanic in his 30's, 6 feet tall, 190 to 200 pounds with black hair, and was wearing a white shirt and jeans.  

Anyone who may have witnessed the collision who has not spoken with police, or anyone with information regarding the suspect or suspect vehicle is urged to call Long Beach Police Accident Investigations Detective Sirilo Garcia at (562) 570-7355.  Anonymous tips may be submitted by calling 1-800-222-TIPS (8477), texting TIPLA plus your tip to CRIMES (274637), or visiting www.lacrimestoppers.org."