Police have released an image of the man who opened fire at the high-end Standard Hotel in Los Angeles,California, on Saturday night.

The unidentified male is seen smiling in surveillance images taken inside the hotel's elevator just seconds before he shot four guests at the hotel, killing one - 21-year-old Thomas Johnson.

Authorities are now hoping that someone will recognize the man, who has managed to evade police.

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Police have released an image of the gunman who opened fire at The Standard Hotel in Los Angeles on Saturday

The suspect is a black man in his 20s with a mustache and cornrows who was wearing a black trench coat on the night of the shooting

The fight that lef to the shooting broke out at 2.40am at the downtown Los Angeles hotel according to police

The suspect is a black man in his 20s with a mustache and cornrows who was wearing a black trench coat on the night of the shooting.

It is believed the fight that lead to the violence broke out when a group of people couldn't get into a birthday party on the hotel's 12th floor at around 2.20am.

Neighbors told the LA Times, they heard loud noises followed by five or six gunshots.

'It sounded like heavy machinery falling,' the man said.

A handgun was found at the scene hours later, a hotel employee told the Times.

Guests were blocked from checking in and checking out as police swarmed the hotel to investigate.

Victims' clothes and shattered glass could be seen strewn across the sidewalk.

Thomas Johnson, 21, was killed and three others were wounded and hospitalized (aftermath of Saturday's shooting above)

The hotel has 207 rooms, a rooftop pool and bar, a rooftop beer garden, a club and a restaurant.

Guests can select from a range of rooms, up to the 'bigger penthouse' which can accommodate a family of six.

The rooftop bar has played host to celebrities such as Owen Wilson, Charlize Theron, Leonardo DiCaprio, and Sophia Coppola.

It has also appeared in movies and TV shows, such as Fracture (starring Rosamund Pike) and an episode of Entourage.