After 28-year-old Alameda County Sheriff's deputy-in-training David Nguyen was fatally shot near the Bay Bridge Tuesday, that county’s sheriff’s association is now offering a $10,000 reward for any information that leads to an arrest.

When we first learned this week that a San Francisco man who was in training to be an Alameda County Sheriff’s Deputy was shot and killed on the approach to the Bay Bridge in Oakland, we did not originally know his identity. But we now know, through many online memorials, that it was 28-year-old David Nguyen, and that heartbreakingly, Nguyen was just one month away from graduating and being sworn on to the force.

At the time he was shot, he was on his way back to San Francisco from the sheriff's department training facility in Dublin.

But police are still searching for clues on why Nguyen was shot on Tuesday, with the Alameda County Sheriff's Office telling KGO that Nguyen was shot for "no apparent reason."

But they’re determined to get to the bottom of it, as NBC Bay Area reports the Alameda County Deputy Sheriff's Association is offering a $10,000 reward for information leading to an arrest of the suspect who shot Nguyen.

KGO also spoke to his sister Barbara Nguyen on the trauma of this week. "I saw his body in the bag,” she told the station. “They put a flag on him. I saw a couple trickles of blood on the floor and that's when I knew they really did try and do everything they could to try and bring him back."

"We came from the Bayview and wanted to service our community and we wanted to make change,” she added. “He was proud to be in law enforcement. He would have made such a great sheriff."

Anyone with information can contact the CHP investigation tip line at 707-917-4491. The family is accepting donations to cover the funeral costs at the following address:

The Police Credit Union
Alameda County Sheriff’s Charitable Foundation
In Memory of David Nguyen
2550 Irving Street
San Francisco, CA 94122

Related: Alameda Sheriff's Recruit Killed In Freeway Shooting Near Bay Bridge [SFist]

Image: @ACSOSheriffs via Twitter