OAKLAND -- A former BART police officer fired last year for allegedly misusing a law enforcement database to research a Hayward murder case involving his daughter is fighting his termination in a lawsuit filed against the transit system this week.

Law enforcement sources say Ronald Rodriguez, of Union City, was fired in November 2013 for running his 22-year-old daughter Veronica Rodriguez's name through a database to see if she was being sought by Hayward police in connection with the May 2010 killing of 17-year-old Hayward High student Samuel Nava.

The Alameda County District Attorney's Office in 2012 charged Veronica Rodriguez and her daughter's father, Robert Yim, with murder in connection with Nava's death. Prosecutors later allowed the young woman to plead guilty to being an accessory after the fact in exchange for her testimony against Yim and a five-year probation sentence.

A jury convicted Yim in December of second-degree murder and three counts of attempted murder for opening fire on a car containing Nava and three friends after a minor confrontation at Hayward's Stonybrook Park. Yim, an alleged gang member, was sentenced Monday to 110 years to life in prison.

Ronald Rodriguez was a 20-year officer before he was terminated in November after two internal affairs investigations into alleged off-duty conduct in violation of BART Police Department, according to the lawsuit filed by the former officer and the BART police union. A BART's Office of the Independent Police Auditor report says that month the police department fired one unnamed officer who "improperly accessed a law enforcement database and misused the information that was obtained."

The lawsuit seeks a chance for Ronald Rodriguez to win his job back through arbitration.

Neither his attorney nor BART returned calls for comment Friday.

Contact Malaika Fraley at 925-234-1684. Follow her at Twitter.com/malaikafraley.