MADISON, Wis. -- The Dane County 911 dispatch center is under fire again for failing to send officers to investigate noise complaints that later became a homicide investigation.

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Madison Police Chief Noble Wray said that the 911 center violated policy when it failed to send officers to respond to two complaints it received about men fighting in Lake Edge Park on Monday night.

Mark Gregory Johnson, 37, was later found dead in the park from multiple head and chest trauma. Officers were eventually dispatched after a third call was received reporting an unconscious person in the park.

Police said Michael Voltz, 46, was arrested on a parole hold in connection with the death. Police said Voltz and the victim were part of a group of six people who are homeless and chronic drinkers who hang out in city parks.

Carl Strasburg, of the Madison Police Department's East District, said that as central parks have enacted alcohol bans, homeless drinkers have moved on to other parks. A proposal to ban alcohol at Lake Edge Park is in the works, WISC-TV reported.

"A lot of homeless people historically have hung round the central district, and now a variety of persons tend to be spread throughout the city and have also frequented the city parks," Strasburg said.

The 911 board recently clarified dispatch policies, saying noise complaints shouldn't be disregarded if multiple calls are received about the same problem.

The center's top official resigned earlier this year after a dispatcher was accused of mishandling a 911 call from a Brittany Zimmermann's cell phone. Zimmermann, a University of Wisconsin-Madison student, was later found slain in her campus area apartment.

On Friday, Kathy Krusiec, interim director of the Dane County 911 Call Center, said an internal investigation into the handling of the 911 calls Monday will be released.

Meanwhile, some city residents and elected officials are fuming about the Dane County 911 Call Center's response to Monday's calls about a disturbance that led to a slaying.

One city alder said he is "ballistic" over the situation and said that finding another 911 service provider is on the table. Council member Paul Skidmore said his anger stems from what should have been a lesson already learned.

"I went ballistic, because when the Brittany Zimmermann incident happened, I thought that would be a wake up call for the county and for the 911 staff -- that they be vigilant. I don't think it happened," said Paul Skidmore, 9th District Common Council member.

"There was a 90-minute gap from when the call came in to when the call came to say there's a body -- 90 minutes; do the math," Skidmore said.

As a member of the 911 Center Board, he's seeking sweeping systemic changes in both how and who handles emergency calls for the city. A 20-year city contract with Dane County for 911 services recently expired, which has Skidmore eyeing options for a partnership elsewhere or a 911 system for the city alone.

"It'd be an expensive alternative, but when you're talking about public safety, that may be the way to go," Skidmore said.

Larry Palm, a 15th District Council member who represents the residents around Lake Edge Park, said he backs the need for a more tightly controlled contract.

"For me, it has always been about the safety," Palm said. "We need to be negotiating a stronger contract that has more of a role and more of say as to how things function."

The news comes the same week the Dane County Board gets consultant feedback on its 911 Center. That feedback was sought in the wake of Zimmermann's death.

Resident Bev Mosel, who lives next to Lake Edge Park, said she is sad, shocked and angry that the beating death could have been prevented.

"I'm very angry. I think that our 911 Center has somebody to answer to," Mosel said. "I would have thought after Brittany Zimmermann that there would have been a lesson learned, and I plan on pursing this to the mayor's office."

Officials at the 911 Call Center agreed that despite two calls Monday night reported a growing disturbance at the park, police were not dispatched.

The reason police weren't dispatched is now the key question.

"Violation of protocol is something else that we will be looking at after we our complete review," Krusiec said.

The first 911 call for a police response came in at 9:18 p.m. Monday

"Yes, I'm calling about a disturbance at Lake Edge Park," said the caller of the first 911 call. "We've got a bunch of homeless guys, foul mouthed, loud, obnoxious. You can see just a bunch of them, so could you send somebody over?"

The 911 dispatcher replied, "Absolutely."

But 16 minutes later with no police squad car, a second 911 call was placed. According to an audio recording of the second call, the caller said the disturbance was escalating and becoming more violent and asked that police be dispatched.

But police weren't dispatched until a third 911 call. That third call came from a cell phone about 90 minutes after the second call, WISC-TV reported.

Responders found Johnson dead from trauma at the park. No weapon was found.

The city leaders are planning to voice their displeasure when the Dane County Board convenes Thursday night.

Despite their frustration, Palm and Skidmore said they believe there have been some improvements at the 911 Call Center since the Zimmermann case. They pointed to how quickly the 911 tapes of Monday's calls were released compared to the Zimmermann tapes, which have yet to be released.

The internal review of the handling of Monday's 911 calls is expected to be released Friday, WISC-TV reported.