SAN JOSE -- A veteran VTA worker has died after being hit by a bus in a maintenance yard in what was called an unprecedented accident, authorities said Friday.

Raul Apostol, who was 62 and lived in San Jose, was hit by a Santa Clara Valley Transportation Authority bus at the Chaboya bus yard in South San Jose on Tuesday night and died at the hospital on Thursday, the transit agency said.

An unidentified VTA employee was driving the bus and has been placed on administrative leave, a standard procedure, while state workplace investigators and sheriff's deputies look into the accident.

VTA spokeswoman Brandi Childress said the crash was caught on camera at 10:40 p.m. at the 33-acre bus yard at 2240 S. Seventh St. near Tully Road and the Santa Clara County Fairgrounds. Apostol was working his usual late-night shift, when he typically cleaned and fueled buses, when the bus struck him, Childress said, declining to comment further.

"We have not had an incident like this before," she said.

Childress said VTA would not be releasing any more information out of respect for the families of the two VTA employees involved, calling it "an internal matter." She said the agency waited until Friday to reveal the accident because it was an isolated incident that did not involve the traveling public.

"We were hopeful that he was going to pull through from the injuries," she said.

Sgt. Jose Cardoza of the Santa Clara County Sheriff's Office said it might take weeks for traffic detectives to complete their investigation. No one has been arrested or cited.

Cal-OSHA said it's also investigating, though it could take up to six months to determine whether it would levy any penalties on the VTA.

In 2001, the Chaboya yard was heralded during a visit by then-U.S. Secretary of Labor Hilda Solis.

Apostol had been a maintenance worker at VTA for 22 years.

"I am deeply sorry for the loss of our employee," VTA General Manager Michael Burns said in a statement. "It is of the utmost importance to thoroughly understand the facts surrounding this incident as the safety of our employees and customers is our top priority. Our thoughts and prayers are with Raul's family, his colleagues and all who have been affected by this tragic incident."

Contact Mike Rosenberg at 408-920-5705. Follow him at Twitter.com/rosenbergmerc.