Man claims self-defense in killing at Arlington park

EVERETT — Dennis Watters Jr. plans to ask a judge to throw out the first-degree murder charge against him just days before his trial is scheduled to begin, arguing that he was defending himself when he fatally shot Ryan Mumm last year at the Blue Stilly Park in Arlington.

Watters’ attorney filed a motion last month to dismiss the charge. She contends “no reasonable trier of fact could find beyond a reasonable doubt that the state’s evidence could support a conviction for first-degree murder.”

Lawyers are expected to argue the motion Friday in front of Superior Court Judge Michael Downes. Watters’ trial is scheduled to begin Monday. He remains in the county jail on $1 million bail.

Prosecutors earlier this year charged Watters, 42, with first-degree murder under the theory that he fatally shot Mumm “under circumstance manifesting an extreme indifference to human life.”

Earlier this month, prosecutors also added a second-degree murder charge under the alternate theory that Watters intended to kill Mumm but didn’t plan the slaying.

Jennifer Rancourt, an attorney with the Snohomish County Public Defender Association, argues that Watters fired his 9mm gun at Mumm “out of fear and in the defense of his life and the lives of those around him; the opposite of extreme indifference for human life.”

The slaying happened after two groups of young people agreed to meet at the park to settle a beef. Watters was recruited by a friend, who told the Tulalip-area man that his daughter had been assaulted. He wanted to confront her attacker.

Watters told detectives that he was reluctant to get involved but he wanted to back up his buddy.

“‘And I pretty much just went to watch somebody get their (expletive) kicked for hittin’ a woman,’” Watters told detectives.

Watters came to the park, packing a 9mm handgun. He told police that he was in the habit of carrying a firearm and has a concealed pistol license. Witnesses said Mumm, 20, also was armed.

It was reported to detectives that Mumm fired two rounds into the air. Watters told police that Mumm pointed the gun at him. He said Mumm fired from the passenger seat as he passed by Watters’ pickup truck.

Watters fired three rounds into the car. He also admitted that he followed after the BMW and tried to bump it off the road.

Mumm was shot in the head. He died the next day.

Prosecutors initially charged the shooting as an assault, saying they didn’t think they could disprove Watters’ self-defense claim beyond a reasonable doubt.

Eight months later they charged him with first-degree murder after ballistic tests concluded that damage to Watters’ pickup came from bullets fired from inside his vehicle. Prosecutors allege that “there is no physical evidence that would support Watters’ claim that he was being shot at,” Snohomish County deputy prosecutor Cindy Larsen wrote.

Instead, Larsen alleges that “Watters fired his gun multiple times at a crowded public park with many other people in the immediate area.”

Others easily could have been struck by the gunfire, Larsen wrote.

Rancourt argues that prosecutors can’t prove that Watters showed extreme indifference. He “demonstrated his concern for innocent lives that were being put at risk by Mr. Mumm,” she wrote in court papers.

Prosecutors argue that there are too many contested facts for a judge to be able to throw out the first-degree murder charge. The witnesses tell somewhat different stories about what happened and some have told multiple versions that are inconsistent.

“It is simply not possible for the court to make a determination of facts in this case sufficient to grant” the defense’s motion for dismissal, Larsen wrote.

Diana Hefley: 425-339-3463; hefley@heraldnet.com.

Talk to us

> Give us your news tips.

> Send us a letter to the editor.

> More Herald contact information.

More in Local News

Girl, 11, missing from Lynnwood

Sha’niece Watson’s family is concerned for her safety, according to the sheriff’s office. She has ties to Whidbey Island.

A cyclist crosses the road near the proposed site of a new park, left, at the intersection of Holly Drive and 100th Street SW on Thursday, May 2, 2024, in Everett, Washington. (Ryan Berry / The Herald)
Everett to use $2.2M for Holly neighborhood’s first park

The new park is set to double as a stormwater facility at the southeast corner of Holly Drive and 100th Street SW.

The Grand Avenue Park Bridge elevator after someone set off a fire extinguisher in the elevator last week, damaging the cables and brakes. (Photo provided by the City of Everett)
Grand Avenue Park Bridge vandalized, out of service at least a week

Repairs could cost $5,500 after someone set off a fire extinguisher in the elevator on April 27.

Jamel Alexander stands as the jury enters the courtroom for the second time during his trial at the Snohomish County Courthouse on Monday, May 6, 2024 in Everett, Washington. (Olivia Vanni / The Herald)
Second trial in Everett woman’s stomping death ends in mistrial

Jamel Alexander’s conviction in the 2019 killing of Shawna Brune was overturned on appeal in 2023. Jurors in a second trial were deadlocked.

(Photo provided by Washington State Criminal Justice Training Commission, Federal Way Mirror)
Everett officer alleges sexual harassment at state police academy

In a second lawsuit since October, a former cadet alleges her instructor sexually touched her during instruction.

Michael O'Leary/The Herald
Hundreds of Boeing employees get ready to lead the second 787 for delivery to ANA in a procession to begin the employee delivery ceremony in Everett Monday morning.

photo shot Monday September 26, 2011
Boeing faces FAA probe of Dreamliner inspections, records

The probe intensifies scrutiny of the planemaker’s top-selling widebody jet after an Everett whistleblower alleged other issues.

A truck dumps sheet rock onto the floor at Airport Road Recycling & Transfer Station on Thursday, Nov. 30, 2023 in Everett, Washington. (Olivia Vanni / The Herald)
Mountlake Terrace transfer station station closed for most of May

Public Works asked customers to use other county facilities, while staff repaired floors at the southwest station.

Traffic moves along Highway 526 in front of Boeing’s Everett Production Facility on Nov. 28, 2022, in Everett, Washington. (Olivia Vanni / Sound Publishing)
Frank Shrontz, former CEO and chairman of Boeing, dies at 92

Shrontz, who died Friday, was also a member of the ownership group that took over the Seattle Mariners in 1992.

(Kate Erickson / The Herald)
A piece of gum helped solve a 1984 Everett cold case, charges say

Prosecutors charged Mitchell Gaff with aggravated murder Friday. The case went cold after leads went nowhere for four decades.

Boeing firefighters union members and supporters hold an informational picket at Airport Road and Kasch Park Road on Monday, April 29, 2024 in Everett, Washington. (Annie Barker / The Herald)
After bargaining deadline, Boeing locks out firefighters union in Everett

The union is picketing for better pay and staffing. About 40 firefighters work at Boeing’s aircraft assembly plant at Paine Field.

Andy Gibbs, co-owner of Andy’s Fish House, outside of his restaurant on Wednesday, May 1, 2024 in Snohomish, Washington. (Olivia Vanni / The Herald)
City: Campaign can’t save big tent at Andy’s Fish House in Snohomish

A petition raised over 6,000 signatures to keep the outdoor dining cover — a lifeline during COVID. But the city said its hands are tied.

South County Fire Chief Bob Eastman at South County Fire Administrative Headquarters and Training Center on Tuesday, April 30, 2024 in Everett, Washington. (Olivia Vanni / The Herald)
Buy, but don’t light: South County firework ‘compromise’ gets reconsidered

The Snohomish County Council wants your thoughts on a loophole that allows fireworks sales, but bans firework explosions south of Everett.

Support local journalism

If you value local news, make a gift now to support the trusted journalism you get in The Daily Herald. Donations processed in this system are not tax deductible.