4:32 PM: A 46-year-old San Francisco man has been arrested on suspicion of fatally stabbing another man early this morning inside a market in the city’s Tenderloin neighborhood.

Patrick Sullivan was arrested at the scene minutes after allegedly stabbing 40-year-old William Quinn, of San Francisco, at about 1:50 a.m. inside the Cadillac Market at 499 Eddy St., according to police.

Police spokesman Sgt. Wilfred Williams said homicide investigators believe a verbal argument between the two men began outside the store and continued inside. It was not immediately known what the argument was about.

Irfan Ali, the owner of the market, said today that one of his employees, who was working behind the counter at the time, told him that a man walked in and asked the employee to call 911.

A second man, apparently Quinn, followed the man inside the store, according to Ali.
Ali said the first man then pulled a knife on Quinn and stabbed him.

Ali said he had “no idea” why the stabbing occurred. He added that police responded quickly to make the arrest and were examining surveillance video from the store.

9:50 AM: A 40-year-old man was fatally stabbed early this morning at a San Francisco market in the city’s Tenderloin neighborhood, authorities said.

The stabbing occurred at about 1:50 a.m. inside the Cadillac Market at 499 Eddy St. at the corner of Hyde Street, police and storeowner Irfan Ali said.

The medical examiner’s office has identified the victim as William Quinn, of San Francisco.

Ali said this morning that one of his employees, who was working behind the counter at the time, told him that a man walked in and asked the employee to call 911.

A second man, apparently Quinn, followed the man inside the store, according to Ali.

Ali said the first man then pulled a knife on Quinn and stabbed him.

Police came immediately and arrested the first man, according to Ali.

Ali said he had “no idea” why the stabbing occurred.

Police this morning did not yet have additional details on the stabbing.

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