Brenner died at the Tijuana convent of Eudist Servants of the 11th Hour, which she founded, said Sister Anne Marie Maxfield yesterday.
Brenner had been ill with a weak heart and myasthenia gravis, a neuromuscular condition.
Brenner first visited La Mesa State Penitentiary in 1965 on a trip to provide medicine and supplies to hospitals in Tijuana, just across the US border from San Diego. She moved into the prison 12 years later when she was 50, holding individual counselling sessions, leading pep rallies at the prison church, and doing countless small tasks for inmates over decades.
She moved out in her final years as her health declined but remained a regular presence at the prison and a beloved figure among Tijuana's powerful and powerless until she died. Brenner was born Mary Clarke in Los Angeles, the second of three children. Her father made a fortune selling office supplies to defence contractors during World War II.
The family lived in Beverly Hills and had an 11-bedroom, ocean-view summer home in Laguna Beach, south of Los Angeles. Later, she moved to Ventura County, her last home before the prison.
Brenner didn't hesitate to intervene in thorny conflicts at the prison, which is marred by a history of violent clashes, including one in 2008 that left about two dozen inmates dead.
"I'm effective in riots because I'm not afraid, I just pray and walk into it," she told The Associated Press in 2005. "A woman in a white veil walks in, someone they know loves them. So silence comes, explanation comes and arms go down."
Alberto Licona, Tijuana's deputy police director and president of Brazos Abiertos, said Brenner founded the group in 1997 after an inmate confided with her about killing a police officer and she sought to help the victim's family.
Her biggest legacy is with the murderers, drug smugglers, thieves and other convicts at La Mesa. She brought bandages, soap and medicine and left with messages to their loved ones.
In 2007, the city renamed a street for her adjacent to the prison.
You’ve hit your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Access to Exclusive Premium Stories Online
Over 30 behind the paywall stories daily, handpicked by our editors for subscribers


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app