The Sacramento Police Department released this photo of the suspect accused of assaulting a man who later died on Sunday, May 15, 2016.

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Sacramento police released a description Monday of a man who they believe was responsible in the death of another man during a music festival at Discovery Park.Witnesses told KCRA that the 31-year-old victim was "sucker punched" Sunday afternoon, and when he hit the ground, he immediately turned gray and blue.The coroner identified the victim Tuesday as Thomas Noble. He was a part-time package handler for UPS in Sacramento."And the people who were fighting were just going at it beating each other, like nonstop," said Miguel Rava, who witnessed the incident.Noble became unresponsive and was pronounced dead at a hospital just before 9 p.m., police said.Police are searching for a man who is described as being in his mid-20s, 5 feet 10 inches tall and weighing 175 pounds. He has an athletic build and was last seen wearing a white T-shirt and cargo pants, police said.Sacramento police closed off an area of Discovery Park near the food booths to investigate the homicide.No other details about the case have been released.People were at Discovery Park for the 102.5 LIVE event hosted by KSFM radio. The concert, which was attended by about 17,000 people, was sold out, according to KSFM's website.Earlier in the day, several people were injured as they ran from a fire in a food vendor's booth which started when a propane tank ignited.Some people thought the loud bang from the propane tank was a gunshot, which prompted some people to break down fences in an effort to try and get out.There was some controversy at the same concert last year when a concertgoer was seen punching a security guard. After the man was taken into custody, the security guard was seen taking another punch at the suspect's head.A police spokesman defended the department's security preparations for this year's concert.Officer Matthew McPhail said more 100 people were assigned to work security at the event, including 39 officers."There was a sizable and, I think, substantial and notable presence of police officers and security personnel at the event. Unfortunately, at the end of the day that presence was unable to prevent this assault from taking place," said McPhail.He said no officers had witnessed the fight or the fleeing suspect.On Sunday, Karen Filben, events coordinator for KSFM, told KCRA 3 that 17,000 people had attended the concert.However, the permit issued by the Sacramento County Parks Department, specified organizers would allow no more than 15,000 people to enter.The radio station did not respond to request for comment Monday.Steve Cottingim, senior vice president for the station's parent company, CBS Radio, issued a statement saying:"We are deeply saddened by the senseless tragedy that took place in line at a food stand yesterday. We want to extend our condolences to the family and friends of the victim during this difficult time."The permit also specified organizers must hire at least 45 private security guards.A spokeswoman for the county parks department said no one was available to comment about the permit's conditions or how compliance was measured.She said it was premature to discuss whether the concert would receive a permit in future years.The police department's spokesman said it has no standard formula for determining how many officers to assign to an event.He said it considers factors such as crowd size, availability of alcohol and past problems.Anyone with information about the incident is asked to call the Sacramento Police Department at 916-264-5471.__KCRA 3's David Bienick, Dana Griffin, Sarah Heise and Maneeza Iqbal contributed to this story.