22-year-old Twitter employee dies after being shot in San Francisco's Mission District after he went to pick up take-out

A 22-year-old Twitter employee was killed in a shooting in San Francisco on Monday night.

Courtney Brousseau was shot on Friday evening at around 8:20pm in the city's Mission District. He succumbed to his injuries on Monday night.

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Courtney Brousseau, 22, was shot on Friday night after he picked up take-out

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Moments before the shooting, he had tweeted a picture of his food on Twitter

Brousseau had been out to pick up take-out food when he was struck by gunfire.

Two men in their 20s got out of their vehicle and opened fire before driving off, according to San Francisco police.

Witnesses said 50 to 60 shots were fired in a shootout between two groups of unidentified people at the intersection of 14th Street and Guerrero.

Shortly before he was shot, Brousseau tweeted a photo of his burrito dinner with a picture of Dolores Park at dusk.

'I just ate a delicious burrito in Dolores Park and for a brief moment everything felt okay,' he wrote.

A spokesperson for Twitter said that staff at the company was heartbroken at his death

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Brousseau worked for Twitter as a product manager and was a bike campaigner

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Witnesses said 50 to 60 shots were fired in a shootout between two groups of unidentified people at the intersection of 14th Street and Guerrero, pictured

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The 22-year-old was caught in a hail of gunfire in San Francisco's Mission District on Friday night

Brousseau, who graduated from the University of California at Berkeley, was a product manager at Twitter. 

Leslie Berland, a spokeswoman for the company, posted a message: 'Today we lost a beloved Tweep, and we're collectively heartbroken.

'I've spent a lot of time on Courtney's timeline to get to know him better. What I discovered is he was the best of us. #LoveForCourtney,' she wrote.

Brousseau was involved in campaigning for more bike lanes and had an interest in bike safety in San Francisco.

'Courtney Brousseau is who I wished my 22-year-old self could have been,' wrote the director of transportation for the San Francisco Municipal Transportation Agency online. 

A 17-year-old boy was also caught in the crossfire although his injuries were not as serious, reports KTVU.

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As well as working for Twitter as a product manager, Brousseau was involved in campaigning for more bike lanes and had an interest in bike safety in San Francisco