SAN JOSE -- On the March day former Santa Clara County Supervisor George Shirakawa Jr. resigned his office, admitted abusing public funds and surrendered to authorities, he appealed to the public for sympathy. He was depressed and a gambling addict, he said in a statement, but he was getting help.

Three days later, a new court filing reveals, Shirakawa made his way back to the Thunder Valley Casino in Northern California to continue the lifestyle he had just disavowed. For the lifelong politician, who gambled away $100,000 in campaign donations, it was not the worst of trips: He lost $200 but got freebies at the gift shop and High Steaks restaurant, according to casino records.

The description of Shirakawa's recent activities comes from a district attorney's filing in advance of an April 30 hearing to set a date for his sentencing. Recommendations from probation officials and a report from his defense team are yet to come.

The DA's report, intended to argue that Shirakawa deserves a year in jail, raises questions as to whether he has learned anything from his fall from grace.

It notes the lifelong San Jose politician was making light of his 12-count criminal indictment the very day he surrendered to the county Sheriff's Department. Shirakawa fired off a playful text to the second-in-command at the prosecutor's office, Jay Boyarsky, ribbing him about being "associated with felons lol" and stating, "but wanted to say that my friendship was sincere hopefully there arr (sic) no hard feelings between all of us."

The 51-year-old Shirakawa's behavior stands in stark contrast with his public confessions and pleas for understanding. After resigning from office the day of his arrest, he stated, "It has been through the treatment process that I realize that I need to accept responsibility for all of my actions. That starts today."

Shirakawa and his attorney, John Williams, declined to comment for this story.

At his sentencing hearing, Shirakawa is expected to argue that he had no prior felony criminal record and boasts a lengthy tenure of public service. It's his addictive tendencies, not any evil motive, his supporters say, that led to the theft of more than $130,000 in donor and public funds.

The price for his theft has now ballooned to encompass the mop-up effort: The cost of a special election to replace the District 2 supervisor is expected to reach $2 million if it goes to a run-off, and County Counsel's office time on his case is now estimated at $108,000.

Prosecutors have now revealed the names of dozens of victims fleeced by Shirakawa between September 2010 and January 2013 through his use of a secret Wells Fargo "slush fund." Tens of thousands of dollars pumped into that account from donations by labor unions, developers, lobbyists and others were used by Shirakawa for his personal use and gambling habit. Among those who contributed: the Santa Clara County Government Attorneys Association Political Action Committee, the Registered Nurses Professional Association Political Action Committee, developer Mark Lazzarini and lobbyist Tony Arreola.

If the disgraced Shirakawa won sympathy by his full admission of a gambling addiction and hasty guilty plea avoiding a trial, he may still lose that sympathy, given the latest revelations from prosecutors.

The defendant, the DA notes with particular irony, allowed his gambling habit to go untreated for years after admitting publicly as far back as 1995 that he had "the fever." All the while, he enjoyed robust health benefits as a public employee, with full knowledge of the county's range of mental health programs, including treatment for addiction.

"Yet until he was facing the reality of criminal charges, defendant never took any steps to turn hope into action in addressing his own problems," says Assistant District Attorney Karyn Sinunu-Towery.

Shirakawa stated on March 1 that "I have been in ongoing medical treatment for my addiction and depression."

But on March 4, court documents show, he was at the Lincoln 100-slot casino, gambling and enjoying a $110.50 comped meal at the steakhouse and $174.38 of goods in the casino's gift shop.

In a recently filed 20-page summary of the case, Sinunu-Towery lays out her argument for a one-year jail term -- one month in jail for each criminal count. She counters his supporters who have blamed his behavior on benign sloppiness, noting that Shirakawa employed a "sophisticated plan" to commit his crimes over many years, duping close friends and staffers in attempts to cover his tracks and hiding secret campaign accounts to feed his gambling habit. In summary, the DA states, "This is a case about public lies, public deception and false promises."

Contact Karen de Sá at kdesa@mercurynews.com or 408-920-5781. Contact Tracy Seipel at tseipel@mercurynews.com or 408-275-0140.