A second firefighter died Saturday morning as a result of injuries sustained in a Diamond Heights blaze.
Antony “Tony” Valerio, 53, was pronounced dead at San Francisco General Hospital at 7:40 a.m., Dr. Andre Campbell said.
“The injuries were too much for him,” Campbell said. “This morning, we had to declare him dead.”
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Valerio had been in critical condition since he was horribly injured in Thursday’s fire.
“This was a minute-by-minute struggle for his life. From the time he got hurt to when he died - and we lost.”
Firefighter Vincent “Vinnie” Perez, 48, died Thursday.
One other firefighter was also injured, but not critically.
Mayor Ed Lee said city flags will remain at half-staff indefinitely.
“I am deeply saddened by the death of two of our veteran SFFD firefighters who died in the line of duty – Lieutenant Vincent Perez and now Firefighter Anthony Valerio," Lee said in a released statement. "These two men have dedicated their lives to protecting the people of San Francisco for decades. This is a terrible tragedy for our City and it is a reminder to us all of the sacrifice that firefighters make along with their family and friends. We are forever appreciative for the brave men and women of the San Francisco Fire Department who put their lives on the line every day for us.
"Our thoughts and prayers are with the families and friends of the Perez and Valerio families as well as the San Francisco Fire Department who are mourning this terrible loss.”
Valerio and Perez were battling a two-alarm blaze at 133 Berkeley Way when a "flashover" -- a surge of searing flame that immediately engulfs a room -- happened.
They are the first firefighters in more than a decade to be killed in the line of duty.